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If the multiplication of two whole numbers is 1, then can we say that one or both of the numbers are equal to 1? Prove your answer with example.

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If multiplication of two whole numbers is 1, then definitely one or both the numbers are equal to 1 or should be reciprocal to each other. 

e.g.- 1 × 1 = 1 and 5 × (1/5) =1

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