Probability in Statistics

Question

For a school fundraiser, 1000 raffle tickets are sold for $5 each. Each ticket is assigned a three-digit number using the digits 0-9. What is the probability that the winning ticket will be one with three repeating digits?

Answer 1

We can begin with the total in this scenario, which would be the 1,000 tickets that we know were sold.

Now we just need to know how many tickets out of those 1,000 are 3-digit repeating numbers.

Well, our only options are:

000

111

222

333

444

555

666

777

888

999

That’s 10 options out of 1,000 (so 10/1,000), which is .01, or 1%

Hope that helps!