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If m is the A.M of two distict real numbers l and n `(l, n gt 1)`and `G_1,G_2 and G_3` are three geomatric means between l and n, then `(G_1)^4+2(G_2)^4+(G_3)^4` equals

A

`4l^2mn`

B

`4lm^2n`

C

`lmn^2`

D

`l^2m^2n^2`

Text Solution

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The correct Answer is:
B
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