Recent content by thx1138

Thank you "Mattmns" as well as others who helped here. I now have an understanding of the logic with this idea. Not sure what I am going to do yet, but I think I might settle for 10 choose 4 . Another note, what happens if the participants do not know how many buttons are needed for...

Correct... 123 would be the same as 321. The order does not matter, just having them actually pushed. So I guess I am still confused... How many ways are there to punch in given combination? I am not sure: 123, 213, 321, 231, 132, 312, others...?hmmm... Then divide by 504? THX1138

Both 84 and 126 seem low to me. However I am not a math person. Can someone explain or show how these numbers are calculated...? My thought process is: At first you have nine choices, then eight, then seven... so 9 X 8 X 7 = 504...?:rolleyes: Please set me straight. THX1138

Thats it?:bugeye: I thought it would be more than 84...? Now I am depressed because I need it to be more than 84 combinations :cry: Thanks for your help... THX1138

No; They will just have to have the correct three turned on when they try to open the door. Order of pressing does not matter. Thanks THX1138

Puzzle question... I am developing an interactive combination lock that involves utilizing a total of 9 buttons to open a door. I am wondering how many combinations there are if the answer requires a certain three to be pushed on? I am not sure how to calculate this, but I am trying to...