Best strategy I think is here:
http://www.winningwithnumbers.com/bingo/how-to-win/"Some statisticians maintain that when it comes to Bingo the balls will fall in a uniform pattern as governed by the laws of probability. In the case of Bingo it means that there will be an equal number of odd and even numbers called and an equal number of high and low numbers. It is also likely that an equal number of numbers ending in 1’s, 2's, 3's, 4’s and so on will also be called.
Obviously, this means that if you can stay in the game long enough, sooner or later your number is going to come up. This has lead some Bingo theorists to speculate that winning at Bingo has more to do with your ability to stay in the game as long as possible than it does blowing all of your money on a lot of cards for a single play.
If this is the case you might want to consider buying fewer cards and staying in the game longer rather than playing many cards at once. Of course, if you are playing online bingo for free, this is not going to be necessary because you don’t pay for the cards usually."
