A bag contains 6 black and 8 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?
Correct answer B. 4/7
Topic / 45 questions
Probability MCQs are quantitative questions that ask how likely an event is, using coins, dice, playing cards, numbered slips and simple expected value problems. They help candidates preparing for NTS, FPSC, SSC and bank job aptitude tests. Every question has an instant answer, so you can check your working and spot common counting mistakes quickly.
Correct answer B. 4/7
Correct answer B. 3/13
Correct answer D. 13/102
Correct answer C. 2/91
Correct answer C. 1/26
Correct answer B. 5/12
Correct answer D. 1/221
Correct answer C. 2/7
Correct answer A. 21/46
Correct answer B. 3/4
Correct answer D. 7/8
Correct answer C. 1/9
Correct answer A. 1/3
Correct answer A. 10/21
Correct answer D. 9/20
Correct answer A. 5/11
Correct answer B. 1/5
Correct answer C. 3/4
Correct answer D. 12.5
Correct answer A. 12.5
Aptitude probability questions are usually short but need careful counting. In this set you will find coin tosses asking for at least one head, cards drawn from a standard pack of 52, slips drawn from a numbered box, and match outcomes where win, draw and loss probabilities must add up to one. Some questions extend into expected profit and loss, for example a seller who gains on each crate sold but loses on each one left over. Mastering complementary events, the addition rule for mutually exclusive events and the multiplication rule for independent events will let you solve most of these quickly.
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Three coins give 8 equally likely outcomes, and only one of them, all tails, has no head. So the probability of at least one head is 1 minus 1/8, which equals 7/8. Using the complement like this is faster than listing every favourable outcome.
Start by memorising the sample spaces for one and two dice, three coins and a 52-card pack. Then practise the complement rule, the addition rule and the multiplication rule on short questions. Always write the total number of outcomes first, because most errors come from miscounting it.
MCQs360 has 45 Probability MCQs in its Aptitude section, each with an instant answer. You can practise them free with no sign-up. Pair them with the Permutation and Combination questions, since counting arrangements is often the first step in harder probability problems.
Last reviewed October 2026