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Re: s and t are positive integers greater than 1. [#permalink]
QA -> S^1/4
QB -> (S^t) / (S^4)

Multiply both sides by S^4
QA -> S^17/4
QB -> S^t

Here value of S and t are unknown. If t value is greater than 17/4 then OB > QA and vice versa. So answer is option D
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Re: s and t are positive integers greater than 1. [#permalink]
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