Having a probability mental block [View all]

[jberryhill]

Problem 1:

I have a bag of 136 unique items.

I reach into the bag, pull out one item.

I return the item to the bag.

I do this 45 times.

After the 45 draws from the bag, how many different unique items have I drawn?

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Problem 2:

I have a bag of 136 unique items.

I reach into the bag and pull out three items.

I return the items to the bag.

I do this 15 times.

After the 15 draws, how many different unique items have I drawn?

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I'm coming up with about 38 for Problem 1, and about 43 for Problem 2, rounding to the nearest whole number.