SERIES
COMPLETION
Sl.No.
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SERIES
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1
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1, 2 ,6,12,20 ____
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2
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25,45,
____ 50
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3
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7,15,31,63 ____
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4
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7,12,19, ____ 39
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5
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0, 6, 24, 60,120,210, _____
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6
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4,6,12,14,28,30, ______
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7
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1,3,6,7,9,____, 12,21
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8
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1,4,9,16,25, _____
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9
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20,19,17, _____ 10,5
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10
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2,3,5,7,11 ____ 17
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11
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6,11,21,36,56, ____
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12
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1,6,13,22,33 ____
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13
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3,9,27,81, ______
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14
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1,9,17,33,49,73, ____
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15
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2,5,9, ____ 20,27
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16
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5,9,17,29,45, ____
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17
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3,7,15,31,63 _____
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18
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1,6,15, ____ 45,66
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19
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1,2,3,5,8, ____
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20
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121,225,361, ____
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21
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0,2,8,14, ____ 34
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22
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5,6,9,15 ____ 40
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23
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17,19,23,29,------ 37
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24
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1,2,5,12,17,58,121,_____
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25
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1,3,4,8,15,27,___
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26
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66,36,18,______
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27
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3,6,18,72
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28
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19,2,38,3,114,4 _____
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29
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2 ___ 8,16,32,64,128,256
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30
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45,54,47,____,49,56,51,57,53
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Sl.No.
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SERIES/ Answers
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1
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1, 2 ,6,12,20 ____ clearly we see the
pattern (n + N2) , 1, 1+12, 2+22, 3+32,4+42,
5+52 i.e. 5 _+25 =30
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2
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25,35,
____ 55
Clearly we see that pattern 5x 5=25, 5
x7=35, Ans. 5x9 =45, 5x11 =55
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3
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7,15,31,63 ____ clearly the rule dedicated between two
adjust ment numbers (x2+1)= 7x2+1=15,15 x 2+1=31,31x 2+1=63,Ans.63 x2+1=127
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4
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7,12,19, ____ 39
Given sequence follows the pattern
5,7,9,11 … i.e. 7+5=12, 12 + 7=19, Ans. 19+9=28, 28 +
11= 39,
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5
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0, 6, 24, 60,120,210, _____
Pattern 13 -1=0, 23
-2=6, 33 -3=24, 43
-4 = 60, 53 -5= 125-5=120, 63 -6=216-6=210, Ans. 73 -7= 343-7=336
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6
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4,6,12,18,28,42, ______
Given sequence in two series
4,12,28,….4 x 9= 36 6,18,42,. 6x9=54
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7
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1,3,6,7,9,____, 12,21 prime numbers of
one series 3,7,13, another series 3 x3, 3x4, 3x5=15
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8
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1,4,9,16,25, _____ 12,
22,32,42,52,62 Ans. 36
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9
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20,19,17, _____ 10,5 The pattern is -1,-02,-3,… 20-1,19-2, Ans.17-3 =14
14-4=1=, 10-5=5
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10
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2,3,5,7,11 ____ 17 prime numbers of
3,7,11,13,17 Ans. 13
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11
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6,11,16,21,36,56, ____ The pattern is
1x5+1=6,2x5+1=11, 3x5+1=16,4x5+1=21, 7x5+1=36, 11x5_1=56, 13x5+1=66
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12
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1,6,13,22,33 ____ the pattern
+5,+7,+9,+11,+13 =46 Ans.
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13
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3,9,27,81, ______
3,32,33,34,35
Ans. 243
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14
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1,9,17,33,57,, ____ adding 8 table in each number i.e.1+8=9,
9+8=17,17+16=33, 33+24=57, 57+32=89
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15
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2,5,9, ____ 20,27 The pattern is
3,4,5, adding 2+3=5,
5+4=9,9+5=14,14+6=20,20+7=27 i.e ans. 14
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16
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5,9,17,29,45, ____ each num. 4th
table adding 5+4=9, 9+8=17, 17+12=29, 29+16=45, Ans. 45+20=65
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17
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3,7,15,31,63 _____
3x2+1=7,7x2+1=15,15x2+1=31,31x2+1=63, 63x2+1= 127
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18
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1,6,15, ____ 45,66 The pattern 1+5=6,
6+9=15, 15+13= 28, 28+17=45, 45+21=66 i.e. ans. 28
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19
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1,2,3,5,8, ____ add 1,2,3,4, 1+1=2,2+1=3,3+2=5.5+3=8.8+4=12
Ans.12
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20
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121,225,361, ____ 112,152,192,
232
An. 529
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21
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0,2,8,14, ____ 34 The numbers
squares-2, 2square-2,3square-2,4square-2,5square-2, 6 square-2
Ans. 25-2=23
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22
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5,6,9,15 ____ 40
5+1=6, 6+1+2=9,9+1+2+3=15, 15+1+2+3+4=25,
25+1+2+3+4+5=40 Ans. 25
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23
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17,19,23,29,------ 37 it is prime numbers con. 17,19,23,29,31,37
Ans. 31
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24
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1,2,5,12,27,58,121,_____ 2x2+1=5, 5x2+2=12, 12x2+3=27, 27x2+4=58,
58x2+5=121, 121x2+6=248 Ans.
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25
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1,3,4,8,15,27,___ the sum of any three
consu cugative 1+3+4=8, 3+4+8=15, 4+8+15=27, 8+15+27=50 Ans.
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26
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66,33,22,______ Ans. 11
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27
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3,6,18,72 ____ 3x1=3,3x2=6,6x3=18, 18
x4=72, 72x5= 360
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28
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19,2,38,3,114,4 _____ The combinations
of two series 19x 2=38, 38 x 3=114, 114 x 4=456
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29
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2 ___ 8,16,32,64,128,256 2x2=4, 4x2=8
8x2=16, 16x2=32, 32x2=64, Ans. 4
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30
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45,54,47,____,49,56,51,57,53
alternative series 54,55,56,567,58,.. 45,47,49,51,53,
Ans. 55.
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