Let a_ 1 b_ 1 c form a GP of common ratio r, where 0<r<1 . If a , 2 ~b , 3 c form an AP…

1. \(1 / 2\)
2. \(1 / 3\)
3. \(2 / 3\)
4. None of these

Answer

(C) 2 / 3

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