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If the sum of the terms of an infinitely...

If the sum of the terms of an infinitely decreasing GP is equal to the greatest value of the fuction `f(x)=x^(3)+3x-9` on the iterval `[-5,3]` and the difference between the first and second terms is `f'(0)` , then show that the common ratio of the progression is `(2)/(3)`.

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