Missing Numbers Quiz Set 039 | Missing Numbers Type of Questions for Aptitude and Reasoning Exams Set 39 | Online self tests for IBPS, Clerical, SO, SSC, SSB, NTSE, Mental Ability Exams

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Question 1

Examine this series: 11, 15, 38, 126. If another series is written with the same rule, what number would come in the place C: 7, A, B, C ?

102

2140

Soln.
Ans: a

Number 102 will come in place of (C). The pattern is: 11 X 1 + 4 = 15, then 15 X 2 + 8 = 38, then 38 X 3 + 12 = 126. Similarly, A = 7 X 1 + 4 = 11, B = 11 X 2 + 8 = 30, C = 30 X 3 + 12 = 102.

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Question 2

One term in the number series is wrong. Find out the wrong term.

11, 42, 39, 164, 525, 421, 749

164

421

525

749

Soln.
Ans: b

In all the rest of the numbers, one digit is the square of the other.

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Question 3

Find the missing number.

26, 37, 50, 65, ?, 101

Soln.
Ans: d

The series is - 5² + 1, 6² + 1, 7² + 1, 8² + 1, 9² + 1 ... So the missing number is 9² + 1 = 82.

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Question 4

What is missing?

¹³⁄_P

¹⁵⁄_Q

^U⁄₆

⁶⁄_U

Soln.
Ans: c

^U⁄₆. The vowels move from the numerator to the denominator. The numbers are their respective positions in the backward sequence of alphabets, that is Z = 1, A = 26, E = 22, I = 18, O = 12, U = 6.

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Question 5

Directions: One number is missing in the series. You have to understand the pattern of the series and then insert the missing number.

3, 128, 6, 64, 9, ?, 12, 16, 15, 8

108

Soln.
Ans: a

There are two alternate series - one, 3, 6, 9, 12, 15 and the other 8, 16, 32, 64, 128 (every number is double of preceding number) . Hence, the missing number will be 32.

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