Question

Find the 4^th term from the beginning and 4^th term from the end in the expansion of (x + 2/x) ⁹.

Answer 1

Given as

(x + 2/x)⁹

Lets T_r+1 be the 4^th term from the end.
Now, T_r+1 is (10 − 4 + 1)th, i.e., 7^th, term from the beginning.