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Number Theory
Level
1
Consider the following pattern:
\[ \begin{array} {l r} \\ 5 ^ 1 = & 5 \\ 5^2 = & 25 \\ 5^3 = & 125 \\ 5^4 = & 625 \\ \end{array} \]
What is the units digit of \( 5^{25} \)?
by
Arron Kau