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Let f (n) = sum _(r =2)^(n) (r )/(""^r C_(2) ""^(r+1) C_(2)) , a = lim _(x to oo) f (n) and x ^(2) -(2n -(1)/(2)) x +t =0 has two positive roots alpha and beta. minimum value of (4)/(alpha ) + (1)/(beta) is : |
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Answer» 2 |
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