exam Maths Puzzle Numerical Ability

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

Read Solution (Total 0)

exam Other Question

A certain sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of interest from both investments is $91. How much is invested at 8%. Graph these linear equations using three points

x + 3Y =3