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Question

If the unit's digit of cube of a number is 6, then what is the unit's digit of the number itself?

A
2
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B
4
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C
6
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D
8
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Solution

The correct option is D 6

Given, the units digit of cube of a number is 6.
Any number having 6 in it's unit's place will have a 6 in the unit's place of cube.
It can be observed ...6×...6×...6=......6

Therefore if the unit's digit of the cube is 6, the number must have 6 in it's unit's place.

Hence, option C is correct.


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