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OpenStudy (anonymous):
The letters A, B, C, D, E and F are randomly placed in a row. The probability that the letters A and B will occupy the first and second positions respectively is: A 1/15 B 1/3 C 1/30 D 1/6 E 2/3
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OpenStudy (lgbasallote):
combinatorics?
OpenStudy (anonymous):
yep but I do not know how to do it.
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