Find the rth term in the expansion of `(x+1/x)^(2r)`

Find the 6th term in the expansion of (x+3)^9 .

Find the 6th term in the expansion of (3x^2-1/3x)^8

Find the 4th term in the expansion of (x-2y)^12 .

If the greatest term in the expansion of (1+x)^(2n) has the greatest coefficient if and only if xepsilon(10/11, 11/10) and the fourth term in the expansion of (kx+ 1/x)^m is n/4 then find the value of mk.

Find the fourth term in the expansion of : (4/7x-y^2)^5 .

Find the 13th term in the expansion of (9x-1/(3sqrtx))^18 , x ne 0 .

Find the general term in the expansion of : (1-x^2)^12 .

Find the third term in the expansion of : (x+2/5y)^4 .

Find the greatest term in the expansion of (3x+ 4y)^28 , when x = 6, y = 3.