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Question

If a number ends with '5' zeros, its square ends with _____ zeros.

A
55
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B
10
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C
3
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D
45
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Solution

The correct option is B 10
In general, if a number ends with 'n' zeros, its square ends with '2n' zeros.

So, if a number ends with '5' zeros, its square ends with 2×5=10 zeros.

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