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Q.

What is the unit digit of a cube of 7?


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a

1

b

2

c

3

d

4 

answer is C.

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Detailed Solution

It is required to find the unit digit of cube 7.
Cube of 7 can be written as,
7×7×7=343    Here, 343 has a unit digit of 3.
Therefore, the number 3 is the unit digit of the cube of 7.
Hence, option 3 is correct.
 
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