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Mathematics 25 Online
OpenStudy (anonymous):

Mark was making himself a sandwich. He could choose white or wheat bread. He could choose turkey, chicken, tuna, or peanut butter. How many different combinations of sandwiches could Mark make?

OpenStudy (anonymous):

P(2,1)*C(4,4)*C(4,3)*C(4,2)*C(4,1) // not sure, but this is how I think about it. P(2,1) you have to choose 1 bread. multiply by C(4,4), possibility of choosing all 4 toppings. C(4,3) choose 3, etc.

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