p303 q23 question: supposing that , where z not equal to 1 by considering (1-z)S, show that thanks!
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Hello Originally Posted by afeasfaerw23231233 p303 q23 question: supposing that , where z not equal to 1 by considering (1-z)S, show that thanks! Note that the red part is the sum of the terms of a geometric sequence, of constant progression z. I think you can go to the result from here, just ask if you can't
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