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Question

Square root of 256 = .

A
14
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B
15
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C
16
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D
12
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Solution

The correct option is C 16

Prime factorization of 256 is

2×2×2×2×2×2×2×2

The square of a number contains every prime number twice.

So, the square root of 256 will contain 2×2×2×2=16

Alternate: 256=2×2×2×2×2×2×2×2

Make pairs of prime numbers

256=2×2×2×2×2×2×2×2 256= 2 × 2 × 2 × 2=16


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