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The unit digit in \(7^{153}\) is?

  • A.6
  • B.0
  • C.7
  • D.1

Answer: C

\(7^{153} = \left ( 7^{4}\right )^{38}\times 7\)
Now, unit digit of \(\left ( 7^{4}\right )^{38} = 1\)
Therefore, unit digit of \(7153 = 1 \times 7\)
\(= 7\)

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