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What is the unit digit of \(5^{2025}\)?

  • A.0
  • B.1
  • C.5
  • D.2

Answer: C

Every positive power of 5 ends in 5:

\[ 5,\ 25,\ 125,\ 625,\ \ldots \]

So \( 5^{2025} \) ends in 5.

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