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OpenStudy (anonymous):
How to find the number of ways to choose 3 pens from 7
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ganeshie8 (ganeshie8):
pick 3 in 7*6*5 ways divide by 3!
OpenStudy (anonymous):
There are 7 pens and you have to choose 3 out of them: So here total things (n) is 7 and things taken r at one time is 3 so: Using combinations: \[\huge ^7C_3 = 35\]
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