Well, I guess the only way to "verify" such a probability would be to repeat the corresponding experiment millions of times.If you repeat a coin flip, or a die toss, sufficiently often, the combined probabilities increase exponentially. For instance, if you flip a coin, the probability to get heads is 1/2; if you flip the coin 20 times, and specify that you want heads EACH AND EVERY TIME, then the combined probability is, of course, 1/2 to the power 20 - or a bit less than one-millionth. Similarly, you can toss a die sufficiently often - to figure out how often, just solve the inequality: 1/6 to the power x < 0.000001 Since you want a whole number, you can just try out a few numbers.