Discrete Math 1 - Tutorial 5 - Combinations

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Permutations - Order is important
Combinations - Order is NOT important
C(n,r)? n Choose r? Sigma Notation? Simple Stuff. :)

If you have not learned this in high school? Go back, politely ridicule your HS math teacher, and demand your money back. Anyway, sarcasm aside...your teachers do work extremely hard for you and you should give them some credit...

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What's "ai" at the last part... I don't know what it means

hothellrider
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