Number Series 15 expected questions or RBI Grade B

Ques1.

2, 8, 14, 24, 34, 48, ?
a. 66
b. 62
c. 58
d. 64
(b): The sequence in the series is:
  
The difference increases by 4 at alternate step.

Ques 2.

1, 2, 3, 2, 4, 5, 4, 5, ?
a. 9
b. 6
c. 10
d. 7
(a): In this series three numbers from a set. The first two numbers of each set are in natural order and the third number is the sum of first and second numbers. The first number of the next set begins with double the first number of  the previous set.


Ques3.

3, 8, 13, 24, 41, ?
a. 65
b. 75
c. 70
d. 80

(c): The sequence in the series is (number + next number ) + addition of natural number increasing by 1 at each step, after beginning from 2.


Ques 4.

2, 4, 4, 8, 16, 16, 256,?
a. 64
b. 36
c. 180
d. 32

(d): There are two alternate series:

Series I : 2,4,16,256 (next number is the square of precious numbers)
Series II : 4,8,16,32 (number is multiplied by 2 to get the next number)

Ques 5.

1, 2, 3, 5, 8, ?
a. 11
b. 13
c. 15
d. 9

(b): The numbers in the series are sum of two numbers preceding them.



Ques 6.

138, 115, 92, 69, 46, ?
a. 9
b. 18
c. 21
d. 23

(d): The numbers in the series are decreasing by 23.

Ques 7.

4, 2, 8, 16, 128, ?
a. 562
b. 1018
c. 2024
d. 2048

(d): The number in the series is product of two numbers preceding it.



Ques 8.

186, 115, 71, 44, 27, ?
a. 19
b. 17
c. 13
d. 21

(b): The sequence in the series is that the number subtracted from its previous number gives the next number.



Ques 9.

128, 64, 32, 16, ?, 4
a. 10
b. 8
c. 6
d. 12

(b): The numbers in the series are divided by 2 at each step.

Ques 10.

1, 1, 2, 8, 64, ?, 65536
a. 1024
b. 2556
c. 4096
d. 1088

(a): The sequence in the series is ×1, ×2, ×4, ×8, ×16, ×64.

   

Ques 11.

1, 2, 4, 8, 16, 32, ?
a. 48
b. 56
c. 64
d. 70

(c): The numbers in the series are double the previous number.

Ques 12.

5, 50, 45, 450, 445, ?, 4445
a. 4450
b. 4600
c. 4550
d. 4500

(a): The sequence in the series is ×10,-5, which is repeated.

Ques 13.

243, 5, 81, 15, 27, 45, 9, ?
a. 5
b. 15
c. 135
d. 27

(c): There are two alternate series:



Ques 14.

1, 2, 2, 5, 3, 10, ?
a. 8
b. 4
c. 7
d. 11

(b): There are two alternate series:
Series I: 1,2,3,4 (numbers are increasing in natural order)
Series II: 2,5,10 (third number is product of previous two numbers)

Ques 15.

4, -8, 14, -22, 32, ?
a. -44
b. 42
c. -42
d. 44
(a) Alternative numbers are marked positive and negative, but the difference between their magnitude increases by 2 at each step.


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