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Question

If a > b > 0 are two real numbers, the value of ab+(ab)ab+(ab)ab+(ab)ab+... is

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Solution

ab+(ab)ab+(ab)ab+(ab)ab+...=tab+(ab)t=tab+(ab)t=t2t2(ab)tab=0t2at+btab=012(ta)+b(ta)=0(t+b)(ta)=0t=b,a

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