find a composite number that is coprime to the number80.
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4 6; 12 14; 16 18; 22 24; 28 30; 30 32; 36 38; 40 42; 42 44; 46 48 ; 52 54; 58 60; 60 62; 66 68; 70 72; 72 74; 78 80
sharma15:
9,15,21,27and so on are also composite number.
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