exam Maths Puzzle Numerical Ability

please solve the problem for me.
nC0.nCn + nC1.nCn-1 + nC2.nCn-2 + ...........+nCn.nC0=(2n!)/(n!)^2

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exam Other Question

A 3:4:1 concrete mix means that for every 2 parts of sand, 3 parts of gravel, and 1 part of cement. How much sand and cement should be used in the mix compound of 27 cubic feet of Please solve as b = 2/3 what is a and c