What is the unit digit in the product (2467)^153 * (341)^72?

A1

B3

C7

D9

Explanation

Unit digit of 2467^153: cyclicity of 7 is 4. 153 mod 4 = 1 => 7^1 = 7. Unit digit of 341^72 is 1. Product unit digit = 7 * 1 = 7.

Exam Relevance

Topic: Number System
Subtopic: Unit Digit

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