Make pairs of coprime numbers from 15, 16, 21, 28
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15-16, 16-21, 21-28, 15-28, 16-28.
From above it is clear that 15 and 16 are co-prime because common factor is 1. Hence pairs 15 and 16, 16 and 21, 15 and 28 are co-primes.
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35-36 is the answer I hope it correct
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