Probability questions and answers

20 questions in 2 online tests, each with its answer and a worked solution.

Start Test 1

Probability: key points

Probability measures how likely an event is: the number of favourable outcomes divided by the total number of equally likely outcomes.

  • Probability always lies between 0 and 1, and P(not A) = 1 − P(A).
  • A pack has 52 cards: 4 suits of 13 cards, 26 red and 26 black, and 12 face cards.
  • Two dice give 36 equally likely outcomes; three coins give 8.

How to practise Probability

Start with the key points, then take one Probability test without rushing. Review every explanation, note the steps you missed and repeat the topic against the clock. APTITUDE TESTER has 20 questions in 2 tests for this topic.

  • Read the method before attempting a timed test.
  • Record mistakes by type: concept, calculation or time management.
  • Return to the hardest questions after a day and try them again.

Continue with another Quantitative topic when your accuracy is steady.

Probability online tests

Sample Probability questions

  1. 1. A fair coin is tossed three times. What is the probability of getting at least one head?
    1. 1/52
    2. 3/8
    3. 7/8
    4. 1/9

    Reference: q-f933c5db-89 · Report this question

    Show answer and solution

    Answer: C. 7/8

    P(no head) = 1/8, so P(at least one head) = 1 − 1/8 = 7/8.
  2. 2. A die is thrown once. What is the probability of getting a multiple of 3?
    1. 1/3
    2. 2/5
    3. 1/5
    4. 1/26

    Reference: q-4663918a-74 · Report this question

    Show answer and solution

    Answer: A. 1/3

    The multiples of 3 are 3 and 6. P = 2/6 = 1/3.
  3. 3. A bag contains 3 red, 9 blue and 4 green balls. One ball is drawn at random. What is the probability that it is red?
    1. 1/4
    2. 9/16
    3. 3/16
    4. 3/13

    Reference: q-1dc7abfb-117 · Report this question

    Show answer and solution

    Answer: C. 3/16

    Total balls = 16. P(red) = 3/16.

See all the questions of Test 1

Probability: questions people ask

How many Probability questions are there?

There are 20 Probability questions in 2 tests. Each test has its own page that lists the questions with their answers and solutions.

How long does a Probability test take?

A test of 10 questions has a time limit of 15 minutes, which is 90 seconds a question.

Is there negative marking?

Rules vary by set. The rules screen shows the time limit, marks, any wrong-answer penalty and calculator permission before you begin. Feedback mode has no time limit or negative marking.

Can I practise Probability without a time limit?

Yes. Choose practice mode: there is no clock, and the answer and solution appear as soon as you select an option.