Probability Questions and Answers updated daily – Aptitude
12 Probability Questions and answers section with explanation for various online exam preparation, various interviews, Aptitude Probability online test. Probability Questions with detailed description, explanation will help you to master the topic.
Probability Questions
1. Bag contain 10 back and 20 white balls, One ball is drawn at random. What is the probability that ball is white
3. A speaks truth in 75% of cases and B in 80% of cases. In what percentage of cases are they likely to contradict each other, narrating the same incident
SHOW ANSWER
Correct Ans:35%
Explanation:
Let A = Event that A speaks the truth
B = Event that B speaks the truth
Then P(A) = 75/100 = 3/4
P(B) = 80/100 = 4/5
P(A-lie) = 1-3/4 = 1/4
P(B-lie) = 1-4/5 = 1/5
Now
A and B contradict each other =
[A lies and B true] or [B true and B lies]
= P(A).P(B-lie) + P(A-lie).P(B)
[Please note that we are adding at the place of OR]