# Baseball Cards

• May 28th 2009, 04:57 AM
magentarita
Baseball Cards
You are trying to collect all nine baseball cards for an All-Star team. Each package of cards you can buy has one card of a memeber of the team. The cards are equally distributed among all the packages. How could you use a simulation to estimate the number of packages of cards you will need to buy to get all nine cards?

I think I need to multiply 9x8x7x6x5x4x3x2x1 to get the correct number of packages. I would need to purchase to make sure that I get all the cards. Am I correct or am I WAY off base?

• May 28th 2009, 04:03 PM
awkward
Magentarita,

There is no way to be sure you will get a complete set, no matter how many packages you buy. For example, you might buy a million packages and they might all turn out to have the same player-- not likely, but possible.

I think the problem is asking you to find how many packages you have to buy, on average, to get a complete set. More formally, let's say X is the number of packages required to get a complete set. X is a random variable, and you would like to find (or estimate) its expected value.