probabilityOnline version mathematics by Info Mind 1 Two brother X and Y appeared for an exam. The probability of selection of X is 1/7 and that of B is 2/9. Find the probability that both of them are selected. a 1/63 b 2/35 c 2/63 d 9/14 2 An urn contains 6red, 5 blue and 2 green marbles. If 2 marbles are picked at random, what is the probability that both are red? a 6/13 b 5/26 c 5/13 d 7/26 3 Four dice are thrown simultaneously. Find the probability that all of them show the same face. a 1/216 b 1/36 c 4/216 d 3/216 4 What is the probability that a number selected from numbers 1,2,3,...,30, is prime number, when each of the given numbers is equally likely to be selected? a 9/30 b 8/30 c 10/30 d 11/30 5 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. a 5/21 b 9/42 c 11/42 d 4/21 6 A five-digit number is formed by using digits 1,2,3,4 and 5 without repetition. What is the probability that the number is divisible by 4? a 1/5 b 5/6 c 4/5 d None of these 7 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? a 35% b 5% c 45% d 22.5% 8 Two cards are drawn from a pack of well shuffled cards. Find the probability that one is a club and other in King. a 1/13 b 4/13 c 1/52 d 1/26 9 You toss a coin AND roll a die. What is the probability of getting a tail and a 4 on the die? a 1/2 b 1/6 c 1/8 d 1/12 10 The probability of success of three students X, Y and Z in the one examination are 1/5, 1/4 and 1/3 respectively. Find the probability of success of at least two. a 1/6 b 2/5 c 3/4 d 3/5
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