Each player has a number of BINGO cards (players can usually play any number of cards). Each BINGO card has 5 rows and 5 columns thus providing 25 spaces.

The columns are labeled from left to right with the letters: 'B', 'I', 'N', 'G', 'O'. With one exception (the center space is "free") the spaces in the card are assigned values as follows: Each space in the 'B' column contains a number from 1 - 15. Each space in the 'I' column contains a number from 16 - 30. Each space in the 'N' column contains a number from 31 - 45. Each space in the 'G' column contains a number from 46 - 60. Each space in the 'O' column contains a number from 61 - 75.

Furthermore, a number can appear only once on a single card. Here's a sample BINGO card: B I N G O 10 17 39 49 64 12 21 36 55 62 14 25 FREE SPACE 52 70 7 19 32 56 68 5 24 34 54 71 The number of unique BINGO cards is very large and can be calculated with this equation: // the B, I, G, and O columns * the N column (15 * 14 * 13 * 12 * 11) ^ 4 * (15 * 14 * 13 * 12) While perhaps interesting to a statistician, the number of possible BINGO cards has nothing to do with player's chances of winning.