The remainder, when $5^{61}$ is divided by 8, is

The least non-negative remainder when $3^{128}$ is divided by 7 is:

The last digit of $12^{13}$ is :

The unit's digit of $13^{13}$ is:

Which of the following holds true?

(A) $26\equiv1(mod\ 5)$

(B) $17\equiv3(mod\ 8)$

(C) $-30\equiv-15(mod\ 3)$

(D) $39\equiv12(mod\ 7)$

Choose the correct answer from the options given below:

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

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