SOLUTION: Jessica cannot remember the correct order of the five digits in her ID number. She does remember that the ID number contains the digits 9, 0, 3, 1, 5. What is the probability that

Algebra ->  Probability-and-statistics -> SOLUTION: Jessica cannot remember the correct order of the five digits in her ID number. She does remember that the ID number contains the digits 9, 0, 3, 1, 5. What is the probability that      Log On


   

Question 296128: Jessica cannot remember the correct order of the five digits in her ID number. She does remember that the ID number contains the digits 9, 0, 3, 1, 5. What is the probability that the first four digits of Jessica’s ID number will all be odd numbers?
possible answers are: 1/4, 1/2, 1/5, 4/5
I need help with this math problem please.
Found 2 solutions by rfer, jrfrunner:
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
5 choices and 4 odd numbers
4/5

Answer by jrfrunner(365) About Me  (Show Source):
You can put this solution on YOUR website!
Let O=event of selecting an odd digit and E=event of selecting an even digit
The probability that the first four digits of Jessica’s ID number will all be odd numbers is P(OOOOE)
If they are independent events then this equals to
P(O)*P(O)*P(O)*P(O)*P(E) = 4/5*(3/4)*2/3*1/2*1/1 = 1/5