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Q.

Find the one's digit of the cube of 3125.

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a

7

b

1

c

3

d

5

answer is C.

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Detailed Solution

 First, consider the number 3125.
Here the last digit of 3125 is 5.
The cube of 5 is 125.
⇒53=125
Here the last digit of 53 is 5.
Hence the one’s digit of the cube of 3125 is 5.

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Find the one's digit of the cube of 3125.