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Scrambling the order of the ten questions

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1. Test takers may omit any two of the TF questions in a 20-question test. How many different 18-question tests might there be? (Two 18-question tests are considered the same if they have the same 18 questions, even if they are in a different order.)

2. Alternate versions of a 10-question multiple choice test can be created by scrambling the order of the ten questions. How many possible versions of the test are there?

3. How many sequences are possible in three tosses of a fair 6-sided die? (An outcome of 1-2-1 is considered a different outcome than 2-1-1.)

Reference no: EM132464753

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