The value of -r-110 r r P r -A- 11-B- 11 -1C- 11 -1D- 11 -11

∑_r=1^10r.^rP_r =∑_r=1^10(r+1 1)r! =∑_r=1^10 ( (r+1)! r! )=11! 1!=11! 1 ...

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nCr Definitions and Properties

The value of ...

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The value of $\sum_{r = 1}^{10} r .^{r} P_{r}$ =

11!

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11! - 1

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11! + 1

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11! - 11

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