In the expansion of $${\left( {\sqrt x + {1 \over {3{x^2}}}} \right)^{10}}$$, the value of constant term (independent of x) is

Read the following information carefully and answer the questions given below.

Consider the expansion of (1 + x)^{2n + 1}.

If the coefficients of x^r and x^{r + 1} are equal in the expansion, then r is equal to

Read the following information carefully and answer the questions given below.

Consider the expansion of (1 + x)^{2n + 1}.

The average of the coefficients of the two middle terms in the expansion is

The sum of the coefficients of all the terms in the expansion is