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Q.

Write the unit digits for the cube of 109.


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a

1

b

7

c

9

d

3 

answer is C.

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Detailed Solution

Here we need to do the cube of 109.
So, we do 109 × 109 × 109 = 1295029.
We can clearly see that the rightmost number in 1295029 is 9.
So, again we have to take the cube of 9 and that is 9 × 9 × 9 = 729.
At the unit place, there are 9.
As we can see on taking the cube of a number which has a unit digit is 9 then we always get 9 as the unit digit in the cube of that particular number.
So, the right answer is 9.
Hence the correct option is 3.
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