There are infinitely many pair of numbers.
Take any two numbers that are coprime. Double both of them. Their GCF is 2.
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If the GCF of two numbers p and q is 7, then the GCF of p2 and q2 is 14.
2 and 40 4 and 10
the two numbers between 20 and 30 which have GCF of 4 are 24 & 28.Prime factorization of :24 = 2 x 2 x 2 x 328 = 2 x 2.......... x 7==============GCF=2 x 2GCF=4
13 and 26, among others.
Since the product of two numbers is equal to the product of their GCF and LCM, the GCF of two numbers is equal to their product divided by their LCM and their LCM is equal to their product divided by their GCF.