Probability – Aptitude MCQ Questions – 09 Posted on July 11, 2020July 11, 2020 by admin Question 1 Two brother X and Y appeared for an exam. Let A be the event that X is selected and B is the event that Y is selected.The probability of A is 1/7 and that of B is 2/9. Find the probability that both of them are selected. Â Â Â A. 1/63 Â Â Â B. 2/35 Â Â Â C. 2/63 Â Â Â D. 9/14 Question 2A speaks truth in 75% of cases and B in 80% of cases. In what percent of cases are they likely to contradict each other in narrating the same event? Â Â Â A. 35% Â Â Â B. 5% Â Â Â C. 45% Â Â Â D. 22.5% Question 3Four cards are drawn at random from a pack of 52 playing cards. Find the probability of getting all the four cards of the same suit. Â Â Â A. 13/270725 Â Â Â B. 91/190 Â Â Â C. 178/20825 Â Â Â D. 44/4165 Question 4There are four hotels in a town. If 3 men check into the hotels in a day then what is the probability that each checks into a different hotel? Â Â Â A. 6/7 Â Â Â B. 1/8 Â Â Â C. 3/8 Â Â Â D. 5/9 Question 5There are 12 boys and 8 girls in a tuition centre. If three of them scored first mark, then what is the probability that one of the three is a girl and the other two are boys? Â Â Â A. 14/75 Â Â Â B. 22/55 Â Â Â C. 44/95 Â Â Â D. None of these Question 6A bag contains 21 toys numbered 1 to 21. A toy is drawn and then another toy is drawn without replacement.Find the probability that both toys will show even numbers. Â Â Â A. 5/21 Â Â Â B. 9/42 Â Â Â C. 11/42 Â Â Â D. 4/21 Question 7The odds against an event are 5 : 3 and the odds in favour of another independent event are 7 : 5. Find the probability that at least one of the two events will occur. Â Â Â A. 69/96 Â Â Â B. 52/96 Â Â Â C. 71/96 Â Â Â D. 13/96 Question 8Two dice are thrown simultaneously. Find the probability of getting a multiple of 2 on one dice and multiple of 3 on the other dice. Â Â Â A. 5/12 Â Â Â B. 11/36 Â Â Â C. 5/36 Â Â Â D. 13/36 Question 9A bag contains 12 white and 18 black balls. Two balls are drawn in succession without replacement.What is the probability that first is white and second is black? Â Â Â A. 18/145 Â Â Â B. 18/29 Â Â Â C. 36/135 Â Â Â D. 36/145 Question 10Four dice are thrown simultaneously. Find the probability that all of them show the same face. Â Â Â A. 1/216 Â Â Â B. 1/36 Â Â Â C. 4/216 Â Â Â D. 3/216