elementary math for teachers

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A deli offers its cheese sandwich with various combinations of mayonnaise, lettuce, tomatoes,
pickles, and sprouts. 5 types of cheese are available. How many different cheese sandwiches are
possible?

  • elementary math for teachers -

    the toppings on each sandwich can be done in 8 ways, the number of subsets of 3 elements. This will include the nullset, or no toppings.

    The wording is not clear as to how many cheeses can go on a sanwich.
    e.g. can you have a sandwich with 3 different cheeses?

    I will assume we can only have one of the 5 cheeses, so the number of different sandwiches is 5(8) or 40.

    If you can have any combination of cheese, there would be 2^5 - 1 or 31 ways to have just the cheese sandwich.
    (I subtracted one to exclude the case of no cheeses. After all it is called a "cheese sandwich")

    So in that case there would be 5(31) or 155 different sandwiches.

    Your call.

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