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Which got me to thinking. Considering the rules of bingo...

1. played on a grid of 5x5 numbers

2. must cover 5 in a row to win

3. the center position is a "FREE" number

what is the maximum number of bottle caps one would need to ensure there are enough bottle caps to play a single card game of bingo?

I say 15. In other words I could cover 15 numbers and still not have bingo. But as soon as I get the 16th (remembering the center position is free) number covered I must win.

Am I right?

tex