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Let S = {1, 2,....., 20}. A subset B of S is said to be "nice", if the sum of the elements of B is 203. Then the probability that a randomly chosen subset of S is "nice" is :(1) 4/220(2) 7/220(3) 5/220(4) 6/220 |
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Answer» Correct option (3) 5/220 Explanation: Sum of all number of set S = 210. We have to find numbers whose sum is 203. So basically we have to remove 7. 7 can be obtained as 7 1, 6 2, 5 3, 4 1, 2, 4 Total = 5 Samples space = 220 So 5/220. |
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