$ ^6C_1 + {^6}C_2 + {^6}C_3 = 6 + 15 +20 = 41$

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A Pizza Shop offers $6$ different toppings, and they do not take an order without any topping. I can afford to have one pizza with a maximum of $3$ toppings. In how many ways can I order my pizza?

- $20$
- $35$
- $41$
- $21$

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