Three coins are tossed. Find the probability of at least 2 tails ?  Answers.
A) 1/2  B) 2/3  C) 1/4  D) 1/8  E) 3/8
n(s) = 2^3 = 8   let E is the event of getting at least 2 tails   n(E) = TTT, TTH , HTT, THT = 4   P(E) = n(E) / n(s)   = 4/8   = 1/2   1/2ns- 1/2
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Three coins are tossed. Find the probability of at least 2 tails ?