Q. 73.7( 9 Votes )

A die is thrown again and again until three sixes are obtained. Find the probability of obtaining the third six in the sixth throw of the die.

Answer :

From the condition given in the question, it is clear that:

Probability of getting a six in a throw of die =


And, probability of not getting a six =


Let us assume,


Now, we have:


Probability that the 2 sixes come in the first five throws of the die


=


Also, Probability that the six come in the sixth throw




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