1.

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 geometrc means between l and n then G_(1)^(4)+2G_(2)^(4)+G_(3)^(4) equals.

Answer»

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

Answer :B


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