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In the group (Q^(+) *) of positive ratio...

In the group `(Q^(+) *)` of positive rational numbers w.r.t. the binary operation *defined `a^(**)b=(ab)/(3)AAa,binQ^(+)`the solution of the equation `5^(**)x = 4^(-1) in Q^(+)` is...

A

`(27)/(20)`

B

`(20)/(27)`

C

`(1)/(20)`

D

20

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A
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