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Precalculus 9 Online
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?

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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