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probabiltyi think
this might be the probability way... Ok so there are seven questions and 2 are answered correctly, so these two can be chosen in 7C2 ways. Now the other 5 questions have to be answered incorrectly, and there are three ways to do this for any one question. So 3.3.3.3.3 = 3^5 ways to answer...- blitz8282
- Post #10
- Forum: Mathematics Extension 1
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