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If 10(Pr)=5040 , find the value of rdot...

If `10_(P_r)=5040 ,` find the value of `rdot`

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Given
`10_(P_r)​=5040`
`(10!​)/((10−r)!)=5040 `
`=((10−r)!)=(10!​)/(5040)`
`=(10xx9xx8xx7xx6!​)/(7xx720)`
`=(10xx9xx8xx7xx720​)/(7xx720) =720`
`(10−r)!`=`6!`
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