The least non-negative remainder when $3^{51}$ is divided by $7$ is :

If it is 7:00 pm currently in the clock, what will the clock show (in am or pm) after 674 hours?

In a game of 100 points, A can give 20 points to B and 28 points to C. How many points can B give C?

The units digit in $12^{108}$ is:

If $X = 11$ and $Y = 3$, then $X \mod Y = (X + aY) \mod Y$ holds

The last digit (unit digit) of $12^{25}$ is

The non-negative remainder when $7^{30}$ is divided by 5 is