SOLUTION: Irving cannot remember the correct order of the five digits in his ID number. He does remember that the ID number contains the digits 1, 4, 3, 7, 6. What is the probability that th
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Question 1162967: Irving cannot remember the correct order of the five digits in his ID number. He does remember that the ID number contains the digits 1, 4, 3, 7, 6. What is the probability that the first three digits of Irving’s ID number will all be odd numbers? Answer by ikleyn(52812) (Show Source):
The total number of all possible permutations of 5 digits is T = 5! = 5*4*3*2*1 = 120.
The total number of those favorable permutations that start with three odd digits 1, 3 and 7, is F = (3*2*1)*2*1.
The probability under the question is the ratio
P = = = = = = = 0.1 = 10%. ANSWER
