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