Co-prime or mutually prime pair are those pair of numbers whose GCD is 1. Given an array of size n, find number of Co-Prime or mutually prime pairs in the array.
Input : 1 2 3 Output : 3 Here, Co-prime pairs are ( 1, 2), ( 2, 3), ( 1, 3) Input :4 8 3 9 Output :4 Here, Co-prime pairs are ( 4, 3), ( 8, 3), ( 4, 9 ), ( 8, 9 )
Approach : Using two loop, check every possible pair of the array. If Gcd of the pair is 1 increment counter value and at last display it.
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Improved By : vt_m