Combinatorics equations

Here, we will be discussing about Combinatorics equations.

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The Combination Formula and Why it Works

In terms of the combinations equation below, the number of possible options for each category is equal to the number of possible combinations for each category since we are only making 1 selection; for example C (8,1) = 8, C (5,1) = 5 and C
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Permutations and combinations

B = { b 1, b 2, b 3,, b n }. To define a one-to-one mapping from A to B, we have n options for f ( a 1), i.e., f ( a 1) ∈ B = { b 1, b 2, b 3,, b n }. Given f ( a 1), we have n − 1 options for f ( a 2) , and
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