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If a(r) be the coefficient of x^(r) in t...

If `a_(r)` be the coefficient of `x^(r)` in the expression `(1+bx^(2)+cx^(3))^(n)" ,Prove that " 2na_(4)=(n-1)a_(2)^(2)`

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`(n-1)a_(2)^(2)`
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