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Question

If a number has '5' zeros at the end, its square will have ___ zeros.

A
15
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B
10
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C
8
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D
5
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Solution

The correct option is B 10
If a number has 'k' zeros at the end, then its sqaure has '2k' zeros.
Therefore when a number has '5' zeros at the end, its sqaure will have 2×5=10 zeros.

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