If a, b, c form a G.P. with common ratio...

If a, b, c form a G.P. with common ratio r such that 0 < r < 1, and if `a,3/2b ,-4c` form an AP, then r is equal to

`(1)/(2)`

`(2)/(3)`

`(1)/(3)`

`(1)/(4)`

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