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If the coefficient of-four successive termsin the expansion of `(1+x)^n` be `a_1`,`a_2`,`a_3`and `a_4`respectivel. Show that`a_1/(a_1+a_2)+a_3/(a_3+a_4)=2 a_2/(a_2+a_3)`

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UNITED BOOK HOUSE-MCQ-EXERCISE
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