Homework Help: math-probability

Posted by Tina on Wednesday, February 13, 2013 at 10:27pm.

A state lottery has a daily drawing to form a four-digit number. The digits 1 through 9 are randomly selected for each of the four digits. For each selection any one of the digits 1 through 9 are possible. What is the probability to the nearest hundredth of the four-digit number having at least one 3?

math-probability - Reiny, Thursday, February 14, 2013 at 7:56am
Use the "back-door" approach

number of possible outcomes with no restriction = 9^4 = 6561

number of cases with "no 3" = 8^4 =4096

So the number of cases that have at least some 3's
= 6561-4096 =2465

prob(at least one 3) = 2465/6561 = .3757
or appr 0.38

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