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It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!

That number is 15/45, a fraction that is smaller than 1. The concept of factors makes sense in context of whole numbers since otherwise every non-zero number is a factor of every number.

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9y ago

What else can I help you with?