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Question
If the rational number `a/b`has a terminating decimal expansion, what is the condition to be satisfied by b?
Solution
Let x be a rational number whose decimal expansion terminates.
Then, we can express x in the form `a/b`, where a and b are coprime, and prime factorization
of b is of the form (2m × 5n), where m and n are non-negative integers.
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