Question: Let a, b1, b2, ... , bn E Z with (a, b1) = (a, b2) = = (a, bn) = 1. Prove that (a, b1b2

Let a, b1, b2, ... , bn E Z with (a, b1) = (a, b2) = = (a, bn) = 1. Prove that (a, b1b2 bn) = 1

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