Question

What is the remainder when ${10}^{25}-7$ is divided by 3?

• A. 1
• B. 2
• C. 3
• D. 0

Answer 1

The correct option is D

0

${10}^x$ when divided by 3, gives a remainder of 1 always. Also $\frac{7}{3}$ gives a remainder of 1.

Thus 1-1=0. Remainder when ${10}^{25}-7$ is divided by 3=0.