Bingo card S. Lowe contracted Columbia University professor Carl Leffler to create 6,000 random and unique Bingo cards. The effort is purported to have driven Leffler insane. Manual random permutation is an onerous and time-consuming task that limited the number of Bingo cards available for play for centuries. The calculation of random permutations is a matter of statistics principally relying on the use of factorial calculations. In its simplest sense, the number of unique "B" columns assumes that all 15 numbers are available for the first row. That only 14 of the numbers are available for the second row (one having been
National Bingo Game of 6 tickets in the evening. In February 2014 the Prize structure of the National Bingo Game was revised and formally launched in March. Zone Prizes were removed and a program of ad-hoc prizes and promotions introduced, in addition to a progressive Jackpot Prize rising to £250,000. The special prizes and promotions vary throughout the year and include luxury cruises, additional cash and travel, while the Jackpot remains a constant prize available to be won on every National Bingo Game throughout the year, with the value of the prize varying dependent upon how many tickets have been sold and when