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James copied a symbol on each of 9 equal-sized strips of paper. He put a dot on 2 of them, a dash on 2 of them, and a pound sign on 5 of them. Then, he put all the strips in a hat and pulled out 3 at random. How many different symbol combinations were possible?

Respuesta :

Use nCr to find that 9 C 3 is 84

You can also use the formula n!/(n-r)!*r! where n is your total amount of objects and r is the number of objects that you choose.

:)

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