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September 30, 2014

September 30, 2014

Posted by **Sharon** on Monday, October 12, 2009 at 10:54am.

- probability -
**economyst**, Tuesday, October 13, 2009 at 10:00amExcel spreadsheets are very helpful for these kinds of problems.

There are 9-choose-0 ways =1 to have a pizza with zero toppings.

9-choose-1 ways = 9 to have 1 topping

9-choose-2 = 36 ways to have 2 toppings

9-choose-3 = 84 ways to have 3 toppings

Repeat for all 4 through 9 toppings.

Then sum all your answers. This is the denominator. The numerator is one.

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