# Algebra

There are 12 students in a social studies class. Three students will be selected to present their term projects today. In how many different orders can three students be selected?

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1. 12! ways

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2. That's not one of the answer choices.
A. 1,320
B. 220
C. 504
D. 36

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4. Nope...
12 students and you are "choosing" three to do their presentation.
Order doesn't matter, so you have a combination 12C3
by definition of combination you have
12C3= n!/(r!(n-3)!
= 12! divided by 3!(9!)
= 12 x 11x10 /3x2x1
= ...

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5. Sorry - I missed the "three"

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6. Ash

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7. So is it a,b,c, or ,d?

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8. its A. 1,320
i just took the test

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