If the coefficients of `(2r+4)^("th")` term and `(3r+4)^("th")` term in the expansion of `(1+x)^(21)` are equal, find r.

Prove that : If the coefficients of (2r+4)^("th") and (r-2)^("nd") terms in the expansion of (1+x)^(18) 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=

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.

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 +1) ""^(th) term and (r+1 )^(th) term in the expansion of (1 + x) ^(42) are equal then r can be

If the binomial coefficient of (2r+4)^(th) term and (r-2)^(th) term in the expansion of (1+x)^(21) are equal, then the value of r equals

If the binomial coefficient of the (2r+4)^(th) term and (r-2)^(th) term in the expansion of (1+x)^(18) are equal find the value of 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 + 1)th term and (r + 2)th term in the expansion of (1 + x)^(48) are equal,find r .