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The remainder when $$\Large 3^{21}$$ is divided by 5 is:

 A) 1 B) 2 C) 3 D) 4

 C) 3

$$\Large 3^{21}\div5$$

Divede = $$\Large \frac{21}{4}$$

$$\Rightarrow$$ remainder 1

$$\Large \frac{3^{1}}{5}=3$$ remainder

Part of solved Number series questions and answers : >> Aptitude >> Number series

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