If a pair of dice are thrown repeatedly until a 7 is thrown, what is the probability that all the other possible numbers from 2 through 12 will have been thrown by the time the 7 has been thrown?
As a preliminary, what is the probability that 2, 11 and 12 will all have been thrown before the first 7?

we can also solve the problem by using the classical definition of probability and other properties..........but i think that this method will be a bit lengthy than that method when we are using the " Bernoullian Sequence " for a finite number of trials...........