Find the value of - 1- 1-2- 2-3- 3-n- n-

1× 1! =(2 1)× 1! =2 × 1! 1× 1!= 2! 1! 2×2!=(3 1)× 2!=3× 2! 2!=3! 2! 3× 3!=(4 1)× 3! =4× 3! 3! = 4! 3! n× n!=(n+1 1)× n! =(n+1)(n!) n!=(n+1) ...

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nCr Definitions and Properties

Find the valu...

Question

Find the value of :
$1 \times 1! + 2 \times 2! + 3 \times 3! + . . . . . . . + n \times n!$

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Solution

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