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If a,b,c are three unequal numbers such that a,b,c are in A.P. and `(b-a) ,. (c-b) ,a ` are in G.P., then the value of a:b: c is-

A

`2:3:4`

B

`3:5:7`

C

`1:2:3`

D

none of these

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The correct Answer is:
C
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