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Number of subsets of n-element set?
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2^n
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Number of permutations of k objects from a set of n objects
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P(n,k) = n!/(n-k)!
ex: how many ways can four books from a set of 10 books be arranged on a shelf? P(10,4)= 10*9*8*7=5040 |
Combination
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A subset, a selection of the elements of the set in which the order of the selected elements doesn't matter
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C(n,k)
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N!/[k!(n-k)!]
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Binomial coefficient
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Entry in row n, column k. C(n,k)
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Pascal's Identity
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Binomial Theorem
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Binomial Series
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