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Precalculus
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OpenStudy (anonymous):
Rafael is taking a test that contains a section of 12 true-false questions. How many of the possible groups of answers to these questions have at least 6 correct answers of true?
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OpenStudy (smileyxl3):
ncr(12,6)=924
OpenStudy (anonymous):
1. 6 right, 6 wrong 2. 7 right, 5 wrong 3. 8 right, 4 wrong 4. 9 right, 3 wrong 5. 10 right, 2 wrong 6. 11 right, 1 wrong 7. 12 right, 0 wrong Just look at how many possibilities --> 7
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