If gcd(a, b) = 1, then for any c:

1
gcd(ac, b) = c gcd(a, b)
2
gcd(ac, b) = gcd(a, b/c)
3
gcd(ac, b) = gcd(a, c)
4
gcd(ac, b) = gcd(c, b)
5
Not Attempted

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