If m is the A.M. of two distinct real...

If m is the A.M. of two distinct real numbers `l` and `n""(""l ,""n"">""1)` and G1, G2 and G3 are three geometric means between `l` and n, then `G1 4+2G2 4+G3 4` equals, (1) `4l^2` mn (2) `4l^m^2` mn (3) `4l m n^2` (4) `4l^2m^2n^2`

`4l^2 mn`

`4lm^2n`

`4lmn^2`

`4l^2m^2n^2`

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