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**

**John E. Franklin****Member**- Registered: 2005-08-29
- Posts: 3,585

2 x 3 x 4 = 24 and 3 x 3 x 3 = 27 and 27 - 3 = 24

3 x 4 x 5 = 60 and 4 x 4 x 4 = 64 and 64 - 4 = 60

1 x 2 x 3 = 6 and 2 x 2 x 2 = 8 and 8 - 2 = 6

4 x 5 x 6 = 120 and 5 x 5 x 5 = 125 and 125 - 5 = 120

This can be proven with the difference of two squares...

(n-1)(n)(n+1) = (n^2-1)n, which is n less than n^3.

**igloo** **myrtilles** **fourmis**

Offline

Pages: **1**