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Q.

What is the unit's digit of the square of number 20121208?


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a

1

b

2

c

3

d

4 

answer is D.

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Detailed Solution

The given number is 20121208.
The unit digit of the given number, 20121208 = 8.
The square of the unit’s digit number = 64.
The unit digit of the squared number, 64 = 4.
Consequently, the unit digit of the square of 20121208 is equal to 4.
Therefore, option 4 is correct.
 
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