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Question

If a1,a2 and a3 be any positive real numbers, then which of the following statement is true?

A
3a1a2a3a31+a32+a33
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B
a1a2+a2a3+a3a13
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C
(a1+a2+a3)(1a2+1a2+1a3)9
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D
(a1.a2.a3)(1a2+1a2+1a3)327
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Solution

The correct option is D (a1.a2.a3)(1a2+1a2+1a3)327
We know that, GMHM

(a1.a2.a3)1/33(1a1+1a2+1a3)

(a1.a2.a3)27(1a1+1a2+1a3)3

(a1.a2.a3)(1a1+1a2+1a3)327

Hence, option D is correct.

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