InterviewSolution
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Two dice are thrown. The events A, B, C, D, E and F are describes as follows. A = Getting an even number on the first die. B. Getting an odd number on the first die. C = Getting at most 5 as sum of the numbers on the two dice. D = Getting the sum of the numbers on the dice greater than 5 but less than 10. E = Getting at least 10 as the sum of the numbers on the dice. F = Getting an odd number on one of the dice. (i) Describe the following events: A and B, B or C, B and C, A and E, A or F, A and F (ii) State true or false:(a) A and B are mutually exclusive.(b) A and B are mutually exclusive and exhaustive events (c) A and C are mutually exclusive events (d) C and D are mutually exclusive and exhaustive events (e) C, d and E are mutually exclusive and exhaustive events (f) A’ and B’ are mutually exclusive events (g) A, B, F are mutually exclusive and exhaustive events |
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Answer» To Find: Describe the given events. Explanation: when two dice are thrown then the no. of possible outcomes are 62 = 36 Now, According to the question, A = Getting an even number of the first die. A = {(2, 1)(2, 2)(2, 3)(2, 4)(2, 5)(2, 6)(4, 1)(4, 2)(4, 3)(4, 4)(6, 1)(6, 2)(6, 3)(6, 4)(6, 5)(6, 6)} B = Getting an odd number on the first dice B = {(1, 1) (1, 2) (1, 3) (1, 4) (1, 5) (1, 6) (3, 1) (3, 2) (3, 3) (3, 4) (3, 5) (3, 6) (5, 1) (5, 2) (5, 3) (5, 4) (5, 5)(5, 6)} C = Getting at most 5 as the sum of numbers on the two dices. C = {(1, 1)(1, 2)(1, 3)(1, 4)(2, 1)(2, 2)(2, 3)(3, 1)(3, 2)(4, 1)} D = Getting a sum greater than 5 but less than 10 D = {(1, 5)(1, 6) (2, 4)(2, 5) (2, 6)(3, 3)(3, 4)(3, 5)(3, 6)(4, 2)(4, 3)(4, 4)(4, 5)(5, 1) (5, 2)(5, 3) (5, 4)(6, 1) (6, 2) (6, 3)} E = Getting at least 10 as the sum of numbers on the dices {(4, 6)(5, 5)(5, 6)(6, 4)(6, 5)(6, 6)} F = Getting an odd number on one of the dices {(1, 2)(1, 4)(1, 6)(2, 1)(2, 3)(2, 5)(3, 2)(3, 4)(3, 6)(4, 1)(4, 3)(4, 5)(5, 2)(5, 4)(5, 6)(6, 1)(6, 3)(6, 5) Now, (i) A and B = AՌB = Փ Since, There is no common events in Both A and B so the intersection is Null (Փ). ⇒ B or C = BUC BUC = {(1, 1) (1, 2) (1, 3) (1, 4) (1, 5) (1, 6) (3, 1) (3, 2) (3, 3) (3, 4) (3, 5) (3, 6) (5, 1) (5, 2) (5, 3) (5, 4) (5, 5) (5, 6)(2, 1)(2, 2)(2, 3)(4, 1)} ⇒ B and C = BՌC BՌC = {(1, 1), (1, 2)(1, 3)(1, 4)(3, 1)(3, 2)} ⇒ A and E = AՌE AՌE = {(4, 6)(6, 4)(6, 5)(5, 6)(6, 6)} ⇒ A or F = AUF AUF = {(2, 1)(2, 2)(2, 3)(2, 4)(2, 5)(2, 6)(4, 1)(4, 2)(4, 3)(4, 4)(6, 1)(6, 2)(6, 3)(6, 4)(6, 5)(6, 6)(1, 2)(1, 4)(1, 6) (3, 2)(3, 4)(3, 6)(4, 5)(5, 2)(5, 4)(5, 6)} (ii) (a) True, because AՌB = Փ (b) True, because AՌB = Փ and AUB = S (c) False, because AՌC = Փ (d) False, because CՌD = Փ but CUD≠S (e) True, because CՌDՌE = Փ and CUDUE = S (f) True, because A’ՌB’ = Փ (g) False, because AՌBՌF = Փ and AUBUF = S |
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