This tries to help answer the question, "how many different items do I need to include if n people are playing so that no one wins on the same bingo call?"
The real answer is, there's no guarantee of anything if the cards and the calls are randomly generated. But this simulation will give you a sense of the probabilities. This assumes a 5x5 bingo card without free spaces.
See Bingo Card Generator - Frequently Asked Questions for details.
(This may be slow if you have a lot of items and/or cards!)
|Calls||average (mean) # of winning cards per simulation||% chance of a winner on this call||% chance of a winner by this call|