Discussion
If \(7^a = 16807\), then the value of \(7^{(a-3)}\) is:
Answer: A
\[ 16807 = 7^{5} \quad\Longrightarrow\quad a = 5 \]
\[ 7^{a-3} = 7^{2} = 49 \]
Equivalently \( \tfrac{16807}{343} = 49 \).
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