Probability - Quantitative Aptitude (MCQ) questions for Q. 784

Q.  Three unbiased coins are tossed. What is the probability of getting at least 2 tails?
- Published on 06 Jul 15

a. 0.75
b. 0.5
c. 0.25
d. 0.2

ANSWER: 0.5
 
S = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}
E = {HTT, THT, TTH, TTT}
n(S) = 8
n(E) = 4
P(E) =n(E) / n(S) = 4/8 = 0.5

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