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10-145.

The order in which the food is selected does not matter.

For a three item lunch, how many items are there to choose from and how many are you going to select?

6C3

Now find how many lunches of two items can be selected.

2 · 6C2

Now find how many lunches of one item can be selected.

6C1

6C3 + 2 · 6C2 + 6C1 = 20 + 2(15) + 6 = 56