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If a ,b ,c are three distinct real numbe...

If `a ,b ,c` are three distinct real numbers in G.P. and `a+b+c=x b ,` then prove that either `x<<-1orx>>3.`

A

`x le - 1 or x ge 3 `

B

`x le - 3 or x ge - 2 `

C

`x le - 4 or x ge 3 `

D

`x le 2 or x ge 5 `

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