1000+ Find the Missing Number Series with Answers - 1

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Question: 1

Find the missing number in the following series.
5, 7, ….., 9, 7, 11, 8, 13

(A) 6

(B) 7

(D) 9

(E) 19

Ans: A

There are two alternate series 5, 6, 7, 8 and 7, 9, 11, 13. Therefore, the missing number will be 6.

Question: 2

Find the missing number in the following series.
3, 6, 6, 12, 9, ….., 12

(A) 11

(B) 13

(D) 18

(E) 29

Ans: D

There are two alternate series 3, 6, 9, 12 and 6, 12, 18, …. Hence, missing number is 18

Question: 3

Find the missing number in the following series.
83, 82, 81, ….., 69, 60, 33

(A) 73

(B) 77

(D) 92

Ans: B

Series has been written in reverse order with a difference of (1)², (1)³, (2)², 2³, 3², 3³ i.e., 1, 1, 4, 8, 9, 27.

Question: 4

Find the missing number in the following series.
4, 8, 12, 24, 36, 72, …..

(A) 92

(B) 96

(D) 102

Ans: B

Series proceeds with a difference of 4, 4, 12, 12, 24, 24. Hence, the missing number is 96.

Question: 5

Find the missing number in the following series.
77, 78, 77, 81, 73, ……, 55

(A) 69

(B) 71

(D) 82

(E) 89

Ans: D

Series increases and decreases alternatively with a difference of +(1)², -(1)³, +(2)², -(-2)³, + (3)², - (3)² i.e., +1, -1, +2, -8, +9, 27.

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