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Question

If a, b, c >0, and abc =5, then find the minimum value of a3+b3+c3.

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Solution

given abc=5
We know that A.M G.M for finite number of real terms
Consider the terms to be a3,b3,c3
A.M =a3+b3+c33
G.M =3a3b3c3=abc=5
A.M G.M
a3+b3+c315
The minimum value is 15

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