InterviewSolution
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The numbers 1, 2, 3 and 4 are written separately on four slips of paper. The slips are then put in a box and mixed thoroughly. A person draws two slips from the box, one after the other, without replacement. Describe the following events: A = The number on the first slip is larger than the one on the second slip. B = The number on the second slip is greater than 2 C = The sum of the numbers on the two slips is 6 or 7 D = The number on the second slips is twice that on the first slip. Which pair (s) of events is (are) mutually exclusive? |
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Answer» Given: There are 4 slips in the box and mixed thoroughly. To Find: Describe the given events . Explanation: Here, Four slips of paper 1, 2, 3, and 4 are put in a box. If Two slips are drawn from it one after the other without replacement. Then The sample space for the experiment is: S = {(1, 2)(1, 3), (1, 4)(2, 1)(2, 3)(2, 4)(3, 1)(3, 2)(3, 4)(4, 1)(4, 2)(4, 3)} (i) A = number on the first slip is larger than the one on the second slip, So, The sample space for A is: {(2, 1)(3, 1)(3, 2)(4, 1)(4, 2)(4, 3)} (ii) B = number on the second slip is greater than 2 So, The sample space for B is {(1, 3)(2, 3)(1, 4)(2, 4)(3, 4)(4, 3)} (iii) C = sum of the numbers on the two slips in 6 or 7 The sample space for C is {(2, 4)(3, 4)(4, 2)(4, 3)} (iv) D = number on the second slip is two times the number on the first slip The sample space if: {(1, 2)(2, 4)} Now, We can see, AՌD = Փ. Therefore, A and D are mutually exclusive events Hence, A and D are mutually exclusive events. |
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