Series

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Find the missing number in the series.
2, 3, 10, 15, ?

A)
25

B)
24

C)
26

D)
28


Correct Answer :

26


Explanation :

The pattern is
1² + 1 = 2
2² - 1 = 3
3² + 1 = 10
4² - 1 = 15
5² + 1 = 26.
So, the missing number is 26.

1000, 200, 40, … What number should come next?

A)
8

B)
10

C)
15

D)
20


Correct Answer :

8


Explanation :

This is a simple division series. Each number is divided by 5.

1000/5=>200
200/5=>40
40/5=>8

Find the missing number in the series.
2, 5, 3, 8, 5, 11, 6, ? , 9

A)
12

B)
13

C)
14

D)
15


Correct Answer :

15


Explanation :

2, 5, 3, 8, 5, 11, 6, ? , 9
2 + 3 = 5,
3 + 5 = 8,
5 + 6 = 11,
missing number = 6 + 9 = 15

5, 7, 10, 15, 22, 33, 46 ,___, ___
Which one of the alternatives will come at the end of the above sequence ?

A)
61,79

B)
63,82

C)
65,85

D)
59,71


Correct Answer :

63,82


Explanation :

The difference between the adjacent numbers itself form a series of consecutive prime numbers

5
5+2 = 7
7+3 = 10
10+5 =15
15+7 = 22
22+11 = 33
33+13 = 46
46+17 = 63
63+19 = 82

The missing number in 1,1,4,8,9,?,16,64 is:

A)
27

B)
23

C)
21

D)
20


Correct Answer :

27


Explanation :

the pattern of series 1=12, 1=13, 4=22 , 8=23, 9=32, 27=33, 16=42, 64=43

Find the missing alphabets in the following:
a_bc_a_bcda_ccd_bcd_

A)
abdbdb

B)
acbdbb

C)
adbbad

D)
bbbbbb


Correct Answer :

adbbad


Explanation :

The series is aabcd / abbcd / abccd / abcdd.
Thus, answer is adbbad

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