[1/2] Three unbiased coins are tossed, what is the probability of getting at least 2 tails ?

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TNPSC G4

10th CBSE Maths

Three unbiased coins are tossed, what is the probability of getting at least 2 tails ?

1/3

1/6

1/2

1/8

Explanation:

Total cases are = 2*2*2 = 8, which are as follows
[TTT, HHH, TTH, THT, HTT, THH, HTH, HHT]
Favoured cases are = [TTH, THT, HTT, TTT] = 4
So required probability = 4/8 = ½

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