Some manufacturers print non-duplicated series of 6,000 cards. Players have thousands of unique (non-duplicated) cards to choose from.
The numbers in the B column are between 1 and 15, in the I column between 16 and 30, in the N column (containing four numbers and the free space) between 31 and 45, in the G column between 46 and 60, and in the O column between 61 and 75. The numbers are assigned at random on each card and are arranged in five columns of five numbers each by five rows (5 x 5 = 25 in total including the blank square).
A Bingo cards contains 24 numbered spaces and one free space (blank), with which you play BINGO.