A fair coin is tossed until either a head comes up or four tails are obtained. What is the expected number of tosses?
To find the expected number of tosses.
A fair coin is tossed until either a head comes up or four tails are obtained.
The tossing of the coin stopped if either a head comes up on the first toss or if tail comes on the first toss and head comes on the second toss and again tail comes two times and third time head comes and so one until four tails come.
The following are the outcomes to stop the tossing of the coin
The number of tosses can’t be more than because after toss either one head will come up or tails will come up
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