Probability » Exercise - 19. If P (A) = 0.4, P (B) = x, P (A ∪ B) = 0.7 and the events A & B are independent, then x = (a) 1/3 (b) 1/2 (c) 2/3 (d) none of these
Probability » Exercise - 12. Two cards are drawn at random and without replacement from a pack of 52 playing cards. Find the probability that both the cards are black ? (a) 7/109 (b) 6/109 (c) 10/102 (d) 25/102
Probability » Exercise - 136. A bag contains 3 red, 4 white and 5 blue balls. All balls are different. Two balls are drawn at random. The probability that they are of different colour, is : (a) 47/66 (b) 10/33 (c) 5/22 (d) none of these
Probability » Exercise - 124. The letter of the word “ASSASSIN” are written down at random in a row. The probability that no two S occur together is : (a) 1/35 (b) 1/14 (c) 1/15 (d) none of these
Probability » Exercise - 120. 3 dice are thrown simultaneously. What is the probability of obtaining a total of 17 or 18 ? (a) 1/9 (b) 1/72 (c) 1/54 (d) none of these