State which of the following is true ?

Options

A. The general term in the expansion of `(a-x)^(n)" is " (-^(n)C_(r)a^(n-r)x^(r))`
B. There are two middle terms in the expansion of `(x-y)^(n)` when n is an even positive integer .
C. In the expansion of `(1+x)^(n)` , the sum of the coefficients of the terms in even positions is equal to the sum of the coefficients of the terms in odd positions .
D. `sqrt2` is a rational number .

Answer

C