Missing Numbers Quiz Set 036 | Missing Numbers Type of Questions for Aptitude and Reasoning Exams Set 36 | Online self tests for IBPS, Clerical, SO, SSC, SSB, NTSE, Mental Ability Exams

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Question 1

Examine this series: 80, 50, 130, 100, 180, 150, 230. If another series is written with the same rule, what number would come in the place B: 900, A, B, C, D, E ?

1050

920

1000

950

Soln.
Ans: b

The series moves like this: -30, +80, -30, + 80, -30, +80... So 900 should be followed by A = 900 - 30 = 870, which should be followed by B = 870 + 50 = 920.

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Question 2

In the following number series, one of the numbers does not fit into the series. Find the wrong number.

5, 8, 10, 12, 15, 18, 20, 23

Soln.
Ans: b

Number 12 is wrong and should be replaced by 13. The series is 3 + 2 = 5, then 5 + 3 = 8, then 8 + 2 = 10, then 10 + 3 = 13, then 13 + 2 = 15, then 15 + 3 = 18. We are adding 2 and 3 alternatively.

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Question 3

1, 2, 5, 12, 27, 58, 121, (?)

247.

248.

249.

246.

Soln.
Ans: b

Start with 1 and follow the pattern: 1 x 2 + 0 gives 2, 2 x 2 + 1 gives 5, 5 x 2 + 2 gives 12, 12 x 2 + 3 gives 27, 27 x 2 + 4 gives 58, 58 x 2 + 5 gives 121, 121 x 2 + 6 gives , 248.

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