Missing Numbers Quiz Set 003 | Missing Numbers Type of Questions for Aptitude and Reasoning Exams Set 3 | Online self tests for IBPS, Clerical, SO, SSC, SSB, NTSE, Mental Ability Exams

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Question 1

Examine this series: 2, 3, 9, 40.5. If another series is written with the same rule, what number would come in the place B: 4, A, B ?

486

3645

Soln.
Ans: d

Number 18 will come in place of (B) . The rule is: 2 X 1 X 1.5 = 3, then 3 X 2 X 1.5 = 9, then 9 X 3 X 1.5 = 40.5. On these lines, A = 4 X 1 X 1.5 = 6, B = 6 X 2 X 1.5 = 18.

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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.

3, 10, 36, 180, 1080, 7560, 60480

Soln.
Ans: b

Number 10 is wrong and should be replaced by 9. The series is 3 X 3 = 9, then 9 X 4 = 36, then 36 X 5 = 180, then 180 X 6 = 1080, etc.,

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Question 3

Which set of numbers is like given set 246, 257, 358?

143, 253, 246.

233, 343, 345.

273, 365, 367.

146, 235, 325.

Soln.
Ans: c

The numerology sums of all the three digits of the terms of the given set are 3, 5 and 7 because 2 + 4 + 6 = 12 → 1 + 2 → 3; 2 + 5 + 7 = 14 → 1 + 4 → 5 and 3 + 5 + 8 = 16 → 1 + 6 = → 7. Similarly sums of all these digits of each term of the set 273, 365, 367, 367 are 3, 5 and 7.

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Question 4

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

4, 7, 12, ?, 28, 39

Soln.
Ans: a

Series proceeds with a difference of 3, 5, 7, 9, 11. respectively. Hence, the missing number will be 19.

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Question 5

Examine this series: 60, 121, 131, 264, 284, 571, 601. If another series is written with the same rule, what number would come in the place D: 120, A, B, C, D, E ?

524

1011

1010

514

Soln.
Ans: a

The number 524 will come in place of (D). 60 X 2 + 1 = 121, then 121 + 10 gives 131, then 131 X 2 + 2 gives 264, then 264 + 20 gives 284, then 284 X 2 + 3 = 571, and so on. On the same pattern, A = 120 X 2 + 1 = 241, then B = 241 + 10 = 251, then C = 251 X 2 + 2 = 504, then D = 504 + 20 = 524.

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