Question

4^61+ 4^62+ 4^63+ 4^64 ko kis no. se completely divide kiya ja skta h ?​

Answer 1

4.5193752e+38

.........................

Answer 2

Ans. 10

Note:We have to take last digit of 61,62,63,64 as a power of 4 to know how 4 and will come.

The last digit of 4^61 will be 4.

{4^1=4}

The last digit of 4^62 will be 6.

{Similarly 4×4=16}

The last digit of 4^63 will be 4.

{Similarly 4×4×4=64}

And again last digit of 4^64 will be 6.

{Similarly 4×4×4×4=256}

If you only add up the last digits of these numbers it will be 20 or we can say last digit will be 0.

Hence it can be completely divided by 10.

Am I right or I am right.