Self
Maths Puzzle
Numerical Ability
sum of n factorials?
Read Solution (Total 2)
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- 1!+2!+---+n!
= n!(1/n!+ 2/n! +......+1/n + 1)
so if the value of n is large then all the terms in the bracket except " 1/n and 1 " can be assumed to be zero.
= n! (n+1)/n = (n+1)! / n is the answer.
1!+2!+---+n! = (n+1)!/n
- 10 years agoHelpfull: Yes(2) No(0)
0!+1!+2!+---+n!;- 10 years agoHelpfull: Yes(0) No(1)
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