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# Number Series : 15 Questions Repeated in the Exams

#### Ques 1.

5, 25, 120, 625, 3125, 15625
(a) 15625
(b) 625
(c) 120
(d) 5
Ans 1. The numbers  in the series are multiplied by 5 to get the next number.
125 should be in place of 120.

#### Ques 2.

4, 8, 11, 22, 18, 36, 24, 50
(a) 8
(b) 22
(c) 36
(d) 24

Ans  2. Two numbers from a pair .The first number increases  by 7 for the next pair and the  second  number is the double of first number.

#### Ques 3.

2, 4, 12, 24, 72, 142, 432
(a) 432
(b) 12
(c) 142
(d) 72
Ans 3. There are two alternate series and in each  series, the numbers are multiplied by 6 to get the next number.

#### Ques 4.

2, 3, 4, 4, 6, 8, 9, 12, 16
(a) 3
(b) 9
(c) 6
(d)12
Ans 4.  There are three alternate  series and in each series,  the numbers are multiplied by 2 to  get the next  number.
series I : 2, 4, 8
series II :  3, 6, 12
series III : 4, 8, 16

#### Ques 5.

97, 91, 86, 83, 79, 77, 76, 76
(a) 86
(b) 76
(c) 91
(d) 83
Ans 5. The difference between the consecutive  numbers in the series decreases by 1 at each step.

#### Ques 6.

7, 11, 11, 9, 15, 7, 19, 5, 23, 1
(a) 5
(b) 7
(c) 1
(d) 9
Ans 6.  There are two alternate series :
series I : 7, 11, 15, 19, 23, ( addition of 4 )
series II : 11, 9, 7, 5, 3 ( subtraction of 2)

#### Ques 7.

3, 7, 12, 28, 48, 118, 192, 448
(a) 12
(b) 118
(c) 28
(d) 7
Ans 7. There are two alternate series and in each series, the numbers are multiplied by 4 to get the next number .
112 should be in place of 118.

#### Ques 8.

1, 6, 12, 19, 27, ?
(a) 38
(b) 35
(c) 36
(d) 54
Ans 8.  The difference between the numbers in the series double each time, after beginning from 5, i.e.

#### Ques 9.

2, 6, 14, 30, 62, ?
(a) 126
(b) 128
(c) 120
(d) 130
Ans 9.  The difference between the numbers in the series doubles each time,after beginning from  4, i.e.

#### Ques 10.

2, 3, 6, 18, 108,?
(a) 1944
(b) 1658
(c) 648
(d) 1008
Ans 10. Every third number in the series is the product to previous two numbers.

#### Ques 11.

1, 8, 27, 64, 125, ?
(a) 172
(b) 176
(c) 216
(d) 189
Ans 11. The sequence in the  series is cube of number in their natural order.

#### Ques 12.

2, 3, 5, 7, 11, 13, ?
(a) 19
(b) 57
(c) 31
(d) 17
Ans 12. The series consists of prime number in  increasing order.

#### Ques 13.

80, 64, 48, 32, 16, ?
(a) 4
(b) 0
(c) 8
(d) 1
Ans 13. The number in the series are decreasing with the  difference of 16 at each  step.

#### Ques 14.

9, 18, 90, 810, 819, ?
(a) 7371
(b) 900
(c) 8100
(d) 1638
Ans 14. The sequence in the series is x 9, + 9 which is repeated.

#### Ques 15.

0, 5, 22, 57, ?, 205
(a) 198
(b) 116
(c) 172
(d) 92
Ans 15. The series follows this sequence : cube of  natural numbers starting from 1 minus  odd numbers starting from 1.