Multiple choice

Three unbiased coins are tossed. The probability of getting at least 2 tails is

  1. $\dfrac{3}{4}$
  2. $\dfrac{1}{4}$
  3. $\dfrac{1}{2}$
  4. $\dfrac{1}{3}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When three unbiased coins are tossed, there are 2^3 = 8 possible outcomes. The outcomes with at least two tails are TTH, THT, HTT, and TTT, which total 4 favorable outcomes. Thus, the probability is 4/8 = 1/2.

AI explanation

The total sample space for tossing three coins has 8 outcomes. The favorable outcomes for getting at least two tails are TTH, THT, HTT, and TTT, giving 4 favorable outcomes. Using the classical probability formula, the probability is 4 divided by 8. The result is 1/2.

Keep practicing — related questions