Find the number of middle terms in the expansion of (a+b)20.
In the expansion of (a+b)n,if n is even, there will be only one middle term, which is (n+22)th term.
Number of middle terms in the expansion of (a+b)20 is:
Find the number of middle terms in the expansion of (a+b)21
Number of middle terms in the expansion of (a+b)21 is: