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Question

Which among the following numbers can be arranged as a square?

A
64
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B
21
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C
12
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D
15
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Solution

The correct option is A 64
The numbers that can be arranged as a square should have the same number of rows and columns.

Here,

64 = 8 ✖ 8

21 = 3 ✖ 7 or 7 ✖ 3

12 = 2 ✖ 6 or 6 ✖ 2 or 3 ✖ 4 or 4 ✖ 3

15 = 3 ✖ 5

The only number that can be arranged as a square with same number of rows and columns is 64.

Hence ‘option a’ is correct.

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