Question

What is the last digit of $6^{109}$?

• A. 3
• B. 8
• C. 6
• D. 4

Answer 1

The correct option is C

6

Consider,
$6^1=6$, last digit is 6.

$6^2=36$, last digit is 6.

$6^3=216$, last digit is 6.

$6^4=1296$, last digit is 6.

On generalizing, we get last digit in $6^{109}$ as 6.