MathematicsMedium64×since 2002Q3005If ara_rar is the coefficient of x10−rx^{10-r}x10−r in the Binomial expansion of (1+x)10(1 + x)^{10}(1+x)10, then ∑r=110r3(arar−1)2\sum\limits_{r = 1}^{10} {{r^3}{{\left( {{{{a_r}} \over {{a_{r - 1}}}}} \right)}^2}}r=1∑10r3(ar−1ar)2 is equal toA3025B4895C5445D1210Check answerSkip