exam Maths Puzzle Numerical Ability

Please solve as b = 2/3 what is a and c

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please solve the problem for me.
nC0.nCn + nC1.nCn-1 + nC2.nCn-2 + ...........+nCn.nC0=(2n!)/(n!)^2 CAN SOMEONE PLEASE HELPE ME WITH THIS..PLEASE
Solve the following system of linear inequalities by graphing
x-2y>4
x<4 there are lines under the greater and lesser sign