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Question

If a number has 4 or 6 in its unit place, then its squares ends in which of the following number?

A
4
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B
5
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C
6
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D
0.0
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Solution

The correct option is C 6
If a natural number has 4 or 6 on its unit place then the square of such numbers also contain 6 in its unit place.

For example:
42=16
62=36
162=256

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