Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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Topic review (newest first)

bobbym
2012-12-11 07:46:45

Hi;

I am getting (n+1)! - 1 but I do not know of a proof of that.

jacks
2012-12-11 06:59:20

Consider all

non empty subsets  of the set
.

For every subset we find the product of each of these elements.

Sum of all these products is?

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