CA Foundation P3 · Chapter 15 · Question 7 of 9
Three fair coins are tossed together. The probability of getting at least one head is:
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) 7/8
Explanation
P(at least one head) = 1 − P(no head) = 1 − (1/2)³ = 1 − 1/8 = 7/8. 1/8 is the probability of no head (all tails), and 3/8 is the probability of exactly one head.
More Probability MCQs
- Q9A card is drawn at random from a well-shuffled pack of 52 cards. The probability that it is a king or a heart is:
- Q1Two fair dice are thrown. The probability that the sum of the numbers is 8 is:
- Q2A bag contains 5 red and 7 blue balls. Two balls are drawn at random without replacement. The probability that both are red is:
- Q3If P(A) = 0.5, P(B) = 0.4 and P(A ∩ B) = 0.2, then P(A ∪ B) is:
- Q4The odds in favour of an event are 3 : 5. The probability of the event is: