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If m is the A.M. of two distinct real numbers A and n( A , n > 1) and G 1 , G 2 and G 3 are three geometric means between A and n, then 4 1 G + 2 4 2 G + 4 3 G equals.

1. 4 A 2 mn
2. 4 A m 2 n
3. 4 A mn 2
4. 4 A 2 m 2 n 2

Correct answer: 4 A m 2 n

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