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OpenStudy (anonymous):
A bag contains 3 red marbles, 5 blue marbles, 2 yellow marbles, and 2 lavender marbles. How many possible sets of three marbles are there?
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OpenStudy (anonymous):
n choose r, where n is the total number of objects and r is the number of objects chosen out of n. So in you case (12 choose 3). Grab a calculator to evaluate
OpenStudy (anonymous):
230?
OpenStudy (anonymous):
@sourwing
OpenStudy (anonymous):
it's 220
OpenStudy (anonymous):
I would assume you had a typo
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OpenStudy (anonymous):
oh yes 220 my bad so you add all together?
OpenStudy (anonymous):
@sourwing can you further explain?
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