If the co-efficient of `(2r+4)th` term and `(r-2)th` term in expansion of `(1 + x)^18` are equal,find `r`

If the coefficients of (2r+1)th term and (r+2)th term in the expansion of (1+x)^(48) are equal,find r.

If the coefficients of (2r + 1)th term and (r + 2)th term in the expansion of (1 + x)^(48) are equal,find r .

If the coefficient of (2r + 4)^(th) term and (r - 2)^(th) term in the expansion of (1 + x)^18 are equal then find r.

If the coefficient of (2r+4)th and (r-2)th terms in the expansion of (1+x)^(18) are equal, find r .

If the coefficients of (2r + 4)th, (r - 2)th terms in the expansion of (1 + x)^18 are equal, find r.

(2) If the coefficients of (2r + 4)th, (r - 2)th terms in the expansion of (1 + x)^18 are equal, find r.

If the coefficient of (2r+ 5) th term and (r- 6) th term in the expansion (1+x)^39 are equal, find r

Given positive integers r>1,n> 2, n being even and the coefficient of (3r)th term and (r+ 2)th term in the expansion of (1 +x)^(2n) are equal; find r

If the coefficients of (2r+4)^(th) term and (r-2)^(th) term in the expansion of (1+x)^(18) are equal then r=