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

You are not logged in. #1 20060126 03:19:25
Door secret code...permutationA secret code that needs to be keyed in using only 1,2,3,4,5 button. If to open the door, u need to press three buttons, how many possible ways there to open the door? Assume tat the same code may be repeated. #2 20060126 07:29:07
Re: Door secret code...permutationIf the code can be repeated, then the answer is 5³ as you say. "The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  Leon M. Lederman 