Question

What is the digit at unit's place of 9n?

Answer 1

The digit at the unit's place of 9n are the unit digits of 9 multiples
that are: 1,2,3,4,5,6,7,8,9,0

Answer 2

Answer:

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

Step-by-step explanation:

To find : What is the digit at unit's place of $9^n$?

Solution :

The number we have given is $9^n$        

We have two cases :

1) If n=even number

So, $9^2=81\\9^4=6561$ n so on.

The unit digit is always 1.

Thus, If n is even then the unit digit is always 1.

2) If n=odd number

So, $9^1=9\\9^3=729$ n so on.

The unit digit is always 9.

Thus, If n is odd then the unit digit is always 9.