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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 decide if I need to use more than nine or less to make this challenging?

I have never taken a stat class so I am basically starting from scratch but I have looked on the internet for permutations, etc...with no real progress...

I would appreciate any information about this...

Thanks

THX1138

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