Permutation

^rP_r = r! now r*r! can be written as (r+1-1)*r!

= (r+1)*r! – r!

=(r+1)! – r!

1*¹P₁ = 2! – 1!

2*²P₂ = 3! – 2!

3*³P₃ = 4! – 3!

So on

By adding all of them we get ultimately 11! -1

Appreciate and Cheers ! Mr. Tejaswi Kasturi !  Looking for more assistance in the future ! Thanks !!

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