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High School Math A Counting Quiz
Conditional Counting and Complements
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3
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Correct：30、Wrong：0
57.33
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Identify the counting type first.
Check whether to add, multiply, use permutation, combination, circular arrangement, repeated objects, or complement.
Check order, repetition, and overlap.
Order matters means permutation. Order does not matter means combination. If direct counting is hard, try complement.
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