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If m is the A.M of two distinct real number l and n (l,n`gt` 1) and `G_(1),G_(2)` and `G_(3)` are three geometric means between l and n, then `G_(1)^(4) + 2G_(2)^(4) + G_(3)^(4)` equal :

A

`4l^(2) mn`

B

`4lm^(2)n`

C

`4lmn^(2)`

D

`4l^(2) m^(2) n^(2)`

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The correct Answer is:
B
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