Question Number 64652 by mathmax by abdo last updated on 20/Jul/19
$${calculate}\:\:{S}_{{n}} =\sum_{{k}=\mathrm{0}} ^{{n}} \:{k}\:\left({C}_{{n}} ^{{k}} \right)^{\mathrm{2}} \\ $$
Commented by mr W last updated on 21/Jul/19
$${please}\:{tell}\:{your}\:{solution},\:{thanks}! \\ $$
Commented by mathmax by abdo last updated on 21/Jul/19
$${i}\:{havent}\:{the}\:{solution}\:{for}\:{this}\:\:{sir}\:{give}\:{me}\:{time}\:{sir}\:{i}\:{will}\:{try}… \\ $$