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Counting and Basic Probability · Question 50 of 65

Question 50

EasyOriginal question

Two fair coins are tossed together. What is the probability of getting at least one head?

Options for question 50

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. The equally likely outcomes are HH, HT, TH and TT.

  2. Only TT has no head, so 3 of the 4 outcomes have at least one head.

  3. Probability =34= \frac{3}{4}.

Worth noting

23\frac{2}{3} lists only HH, 'one head' and TT, but 'one head' happens in two ways (HT and TH), so those three are not equally likely. 14\frac{1}{4} is P(no head).

Concept
Sample space for two coins
Typical time
40 s
Your time
—
The rule this testsCoins, dice and cards
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