Wednesday, March 11, 2015

3/11/15

(a,b) = gcd(a,b) and [a,b] = lcd(a,b).

Prove (a,b,c)^2/(a,b)*(b,c)*(c,a) = [a,b,c]^2/[a,b]*[b,c]*[c,a]

Hint: Use combinatorial identities

Level: 6

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