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Question:

A game consists of tossing a coin 3 times and noting the outcome each time. If getting the same result in all the tosses is a success, find the probability of losing the game.

Solution:

The total no. of outcomes 2^3=8
The no. of favourable outcomes is 2
So P(S)=2/8=1/4
For loosing P(F)=1-P(S)=1-1/4=3/4