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Question

The One’s digit of the cube of '23' is:


A

6

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B

7

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C

3

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D

9

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Solution

The correct option is B

7


We know that,
The cube of numbers having 1,4,5,6or9 at one's place will end in 1,4,5,6or9
And, if the numbers have:
2 at one's place, then its cube ends in 8
8 at one's place, then its cube ends in 2
3 at one's place then its cube ends in 7
7 at one's place then its cube ends in 3
0 at one's place then its cube ends in 0

Here, the one's digit in the number '23' is '3‘, So, its cube will end in ’7'.

Therefore, the correct option is B.


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