If the coefficient of rth and `(r+1)th` terms in the expansion of `(3+7x)^29` are equal,

If the coefficients of rth and (r+1) th terms in the expansion of (3+7x)^(29) are equal,then r equals a.15 b.21 c.14 d.none of these

If the coefficients of rth and (r+1)t h terms in the expansion of (3+7x)^(29) are equal, then r is equals to a. 15 b. 21 c. 14 d. none of these

If the coefficients of rth and (r+1)t h terms in the expansion of (3+7x)^(29) are equal, then r is equals to a. 15 b. 21 c. 14 d. none of these

If the coefficients of rth and (r+1)t h terms in the expansion of (3+7x)^(29) are equal, then r equals a. 15 b. 21 c. 14 d. none of these

If the coefficients of rth and (r+1)t h terms in the expansion of (3+7x)^(29) are equal, then r equals a. 15 b. 21 c. 14 d. none of these

If the coefficients of r^(th) and (r+1)^(th) terms in the expansion of (3+7 x)^(29) are equal, the r is equal to