Which of the following

Question:

Which of the following will have 4 at the unit’s place?

(a) 142                 

(b) 622                 

(c) 272             

(d)352

Solution:

(b) The unit place of the square of $14=4^{2}=16=6$

The unit place of the square of $62=2^{2}=4$                   $\left[\because 2^{2}=4\right]$

The unit place of the square of $27=7^{2}=49=9$

The unit place of the square of $35=5^{2}=25=5$

Clearly,  $62^{2}$ has 4 at the unit's place.

 

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