prove that the coefficient of middle term in the expansion of(1+x)^2n is the same as the sum of coefficient of two middle term in the expansion of (1+x)^2n_1
 
        prove that the coefficient of middle term in the expansion of(1+x)^2n is the same as the sum of coefficient of two middle term in the expansion of (1+x)^2n_1
 
         
        In trapezium ABCD,AB||DC and AD IS PRODUCED TO E, Such that<CDE=75°. Find the values of x, y and z.
 
         
        