Show that a fraction r = a/b in lowest terms has a finite decimal expansion if and
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Show that a fraction r = a/b in lowest terms has a finite decimal expansion if and only if
Observe that r has a finite decimal expansion when 10Nr is an integer for some N ≥ 0 (and hence b divides 10N).
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b= 25m for some n,m ≥ 0
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