Q.9. A box contains 10 black and 10 white balls. The probability of drawing two balls of the same colour, is:
(A) 9/19
(B)8/37
(C) 11/19
(D) 5/19
(E) None of these
Q.10. In a class, there are 15 boys and 10 girls. Three students are selected at random. The probability that 1 girl and 2 boys are selected, is:
(A) 21/46
(B) 25/117
(C) 1/50
(D) 3/25
(E) None of these
Q.11. A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random from this box. The probability that at least one of these is defective, is
(A) 4/21
(B) 7/19
(C) 12/21
(D) 31/97
(E) None of these
Q.12. Two dice are tossed. The probability that the score is prime number is:
(A) 1/7
(B) 5/12
(C) 1/4
(D) 1/2
(E) None of these
Q.13. A man and his wife appear in an interview for two vacancies in the same post. The probability of husband’s selection is (1/7) and the probability of wife’s selection is (1/5). What is the probability that only one of them is selected?
(A) 5/4
(B) 2/7
(C) 8/17
(D) 4/9
(E) None of these
Q.14. In a lottery, there are 10 prizes and 25 blanks. A lottery is drawn at random. what is the probability of getting a prize ?
(A) 2/9
(B) 3/6
(C) 2/7
(D) 5/7
(E) None of these
Q.15. A card is drawn from a pack of 52 cards. The probability of getting a queen of club or a king of heart is:
(A) 1/11
(B) 2/13
(C) 1/26
(D) 1/52
(E) None of these
Q.16. From a pack of 52 cards, one card is drawn at random. What is the probability that the card drawn is a ten or a spade?
(A) 4/13
(B) 13/4
(C) 1/13
(D) 1/26
(E) None of these
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