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Number series
The remainder when \( \Large 3^{21} \) is divided by 5 is:
A) 1
B) 2
C) 3
D) 4
Correct Answer:
C) 3
Description for Correct answer:
\( \Large 3^{21}\div5 \)
Divede = \( \Large \frac{21}{4} \)
\( \Rightarrow \) remainder 1
\( \Large \frac{3^{1}}{5}=3 \) remainder
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