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| the sum of the product obtained by multiplying the value associated with each possible outcome by its probability |
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| fundamental counting principle |
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| if Act 1 can be performed in m ways and Act 2 can be performed in n ways, no matter how Act 1 turns out, then the sequence Act 1 - Act 2 can be performed in m*n ways |
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| a selection in which order does not matter |
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| the product of all positive integers less than or equal to the number in question |
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1
1 2 1
1 3 3 1
1 4 6 4 1
....... |
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