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From the set {2, 3, 4, 5, 6, 7, 8, 9}, h...

From the set `{2, 3, 4, 5, 6, 7, 8, 9}`, how many pairs of co-primes can be formed?

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Recall the defination of primers and proceed.
(b) Form all the pairs of co-primers with each of the sets like `(2,3),(2,5)`, etc.
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