Bunuel wrote:
A coin that is tossed will land heads or tails, and each outcome has equal probability. What is the probability that the coin will land heads at least once on two tosses?
A. 1/4
B. 1/3
C. 1/2
D. 2/3
E. 3/4
Total outcomes when a coin is tossed twice = 2*2 = 4
METHOD 1:Case 1: Exactly 1 Head outcomes will be HT or TH i.e. 2 outcomes
Case 2: Exactly 2 Head outcomes will be HH i.e. 1 outcome
Favourable Outcomes = 3
Probability = 3/4
METHOD 2:Unfavourable case is when None of the toss results in a Head i.e. Both Tails i.e. TT i.e. 1 outcome
Unfavourable Probability = 1/4
Favourable Probability = 1- Unfavourable probability = 1- (1/4) = 3/4
Answer: Option E
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