The Total solution for NCERT class 6-12
Find the 4th┬аterm from the end in the expansion of (4x/5тАУ 5/2x)┬а9.
Given:
(4x/5 тАУ 5/2x)┬а9
Let Tr+1┬аbethe┬а4th term from the end of the given expression.
Then, Tr+1┬аis(10 тИТ 4 + 1)th term, i.e., 7th term, from the beginning.
T7┬а= T6+1
тИ┤ The 4th┬аtermfrom the end is 10500/x3.