🧠 GRE Exam Prep

What is the remainder when 7^10 is divided by 5?

A 1
B 2
C 3
D 4

✓ Correct Answer: Option D

The pattern of remainders when powers of 7 are divided by 5 is: 7^1≡2, 7^2≡4, 7^3≡3, 7^4≡1. The pattern repeats every 4 powers. Since 10 divided by 4 has a remainder of 2, 7^10 has the same remainder as 7^2, which is 4.

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