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In fully reduced fractional form, which prime factors can appear in the denominator of a terminating decimal?

AOnly 2 and 5
BOnly 2 and 3
COnly 3 and 5
DOnly 5 and 7
Answer & Solution
Correct answer: A. Only 2 and 5
A fully reduced fraction has a finite decimal representation if and only if its denominator contains only prime factors 2 and 5.
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