Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**jacks****Member**- Registered: 2012-11-21
- Posts: 128

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?

*Last edited by jacks (2012-12-10 07:59:38)*

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 106,403

Hi;

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

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.****No great discovery was ever made without a bold guess. **

**Online**

**scientia****Member**- Registered: 2009-11-13
- Posts: 224

Offline

Pages: **1**