If 1- r -018 r r -2-1 r - n - then n is not divisible byA- 4B- 6C- 10D- 20

The correct option is B 6 1 + ∑_r=0^18 (r(r+2)+1)r!=20! ⇒ n = 20 ...

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Factorial

If 1+∑ r =018...

Question

If $1 + \sum_{r = 0}^{18} (r (r + 2) + 1) r! = n!$ , then n is not divisible by

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