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নিম্নের কোন বিবৃতিটি সত্য-?

{}_{r}^{n}C r! = {}^{n}P_{r}

{}^{n}P_{r} r! = {}^{n}C_{r}

\frac{{}^{n}C_{r}}{(r + 1)!} = {}^{n}P_{r}

\frac{{}^{n}C_{r}}{{}^{n}P_{r}} = \frac{1}{r}

ANS : 1

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