College of Admission Tests Multan

Probability

Solve the question of and select the option from the choices A through D/E. Check your Answer and view the explanation.

Question: 3

Three unbiased coins are tossed, what is the probability of getting at least 2 tails ?
  • 1/3
  • 1/6
  • 1/2
  • 1/8

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Correct Answer: C

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 = 1/2