Question

What is the digit at unit’s place of 9n

?

Answer 1

Answer:

The digit at unit's place of 9n is either 1 or 9.

Answer 2

Answer:

The digit at unit’s place of 9^n can be either be 1 or 9

Step-by-step explanation:

According to question there will two cases

Case 1 :

If n = even, then the unit digit is 1

As, 9^2= 81, 9^4= 6561, and so on

Here, unit digit is 1

Case 2:

If n = odd, then the unit digit is 9

As, 9^1= 9, 9^3= 729, and so on

Here, unit digit is 9

Hence,

The digit at unit’s place of 9^n can be either be 1 or 9