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Two dice of different colours are thrown simultaneously. The probability that the sum of the faces appeared is either 7 or 11 is?up vote0down votefavoriteThe options are: (A) 7/36 (B) 1/9 (C)2/3 (D) 5/9 |
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Answer» DICE are usually marked from 1 to 6 The POSSIBLE sums are from 2 to 12 The total numbers of sums = 36 In the sums, 7 APPEARS 6 TIMES, while 11 appears 2 times Probability = No. of desired outcomes/Total No. of possible outcome Probability of getting a sum of 7 or 11 = 8/36 = 2/9 ALTERNATIVELY Probability of getting sum of 7 = 6/36 = 1/6 Probability of getting sum of 11 = 2/36 = 1/18 Probability of getting sum of 7 or 11 = 1/6 + 1/18 = 2/9 NOTE: As can be seen from the calculations above, none of the choices given is correct. |
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