Probability – Aptitude MCQ Questions – 09

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.

Question 2
A 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?

Question 3
Four 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.

Question 4
There 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?

Question 5
There 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?

Question 6
A 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.

Question 7
The 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.

Question 8
Two dice are thrown simultaneously. Find the probability of getting a multiple of 2 on one dice and multiple of 3 on the other dice.

Question 9
A 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?

Question 10
Four dice are thrown simultaneously. Find the probability that all of them show the same face.

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