When picking the numbers in a game of Keno you should try to select numbers from all over the chart. Your odds of winning in this game depend on the different numbers that you select.
However, if you pick all 15 of the numbers that you are allowed to your winnings can be tremendous, but it also may never happen that all fifteen numbers win.
So, it is absolutely up to you to decide the total of numbers to select.
As Keno is a game of chance and luck there is no strategy or skill involved just place your wager and select your numbers, sit back and see what happens.