Discussion
\(125 \times 125 \times 125 \times 125 \times 125 = 5^?\)
Answer: C
\[ 125 = 5^{3} \quad\Longrightarrow\quad 125^{5} = (5^{3})^{5} = 5^{15} \]
So the exponent is 15. Multiplying five copies of \( 5^{3} \) adds their exponents.
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