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54.A coin is tossed repeatedly thrice. What is the probability that the same face appears all thethree times?

Answer»

Let us consider all the possibilities (2^3=8)

HHT, HTH HTT HHH

THT TTH TTT THH

From the above we can see that there are only two possibilities namely HHH and TTT. So there are only two favourable cases and eight exhaustive cases.

So probability = favourable cases/Exhaustive cases = 2/8 =1/4 = 0.25



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