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If the coeffcients of four successive te...

If the coeffcients of four successive terms in the espansion of `(1+x)^(n)"be " a_(1),a_(2),a_(3)anda_(4)` respectively , 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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