Given that A.B.C is a positive integer, what is the answer to prove that (a + b) (B + C) (c + a) is greater than or equal to 8abc
a+b>=2(ab)^1/2
b+c>=2(bc)^1/2
c+a>=2(ac)^1/2
So (a + b) (B + C) (c + a) is greater than or equal to 8abc
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