If a, b, c and d are in G.P. show that ...

If a, b, c and d are in G.P. show that `(a^2+b^2+c^2)(b^2+c^2+d^2)=(a b+b c+c d)^2` .

A

`(ab+ac + bc)^2`

B

`(ac+ cd+ad)^2`

C

`(ab+bc+cd)^2`

D

`(ab+bc+ad)^2`

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The correct Answer is:

C

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