A number when divided by 5 leaves a remainder 4 What is the remainder when the square of the same nu...........

Quantitative Aptitude ( CCS) Number System

A number when divided by 5 leaves a remainder 4. What is the remainder when the square of the same number is divided by 5?

Let the number be 5a + 4
square of the number = 25a^2 + 16 + 40a
so remainder = 1 (16 divided by 5 leaves a remainder 1)

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