Q. 105.0( 2 Votes )

If n is a rational number, then units digit in 6n – 5n is:
A. 1

B. 6

C. 5

D. 9

Answer :

Any power of 6 will have 6 at its units place and any power of 5 will have 5 at its units place. So when we subtract the units digits that is 6 – 5 we get 1 as the answer.

So the correct answer is A.

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