Question
If $r^{\text{th}}$ and $(r + 1)^{\text{th}}$ terms in the expansion of $(p + q)^n$ are equal, then $r^{(p+q)}$ is ......
If $r^{\text{th}}$ and $(r + 1)^{\text{th}}$ terms in the expansion of $(p + q)^n$ are equal, then $r^{(p+q)}$ is ......