If ${ }^n P_r={ }^n P_{r+1}$ and ${ }^n C_r={ }^n C_{r-1}$, then the value of $r$ is equal to: [JEE Main 2021, 25 Jul (Shift 2)]

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If \({ }^n P_r={ }^n P_{r+1}\) and \({ }^n C_r={ }^n C_{r-1}\), then the value of \(r\) is equal to: [JEE Main 2021, 25 …