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Mathematical Reasoning MCQ - Number Series

16 Find the missing number in the following series.
512, 256, 128, ?, 32, 16, 8

Each number is half of its preceding number.

17 Find the missing number in the following series.
2, 7, 17, 32, 52, 77,?

+5, +10, +15, +20, +25, +30

18 Find the missing number in the following series.
15, 18, 24, ?, 45

+3, +6, +9, +12

19 Fill in the missing number in the following arrangement based on some principle.

8	6	4
3	?	7
14	16	18

In first row, it is −2; in second row, it is +2, and in third row, it is +2.

20 Find the missing number in the following series.
8, 24, 12, ?, 18, 54

Multiply the first by 3 and divide the number so obtained by 2. This is to be done alternatively for all other numbers

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Easy 33%
Medium 33%
Hard 34%

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Strong work at 0% accuracy. Attempt the hardest Number Series questions and explain why every incorrect option is wrong.

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Question:

720, 120, 24, 6, ..., 1

A. 1
B. 2
C. 3
D. 4

Correct answer: B

Explanation:

720 divided by 6 = 120 120 divided by 5 = 24 24 divided by 4 = 6 6 divided by 3 = 2 2 divided by 2…

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