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OpenStudy (anonymous):
a medal for solver. There are 12 books on a shelf. How many ways are there to choose five of them, so that no two of the chosen books stand next to each other?
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OpenStudy (nurali):
7 are left (0) and the 5 taken out could be from any 5 of places marked (x) x 0 x 0 x 0 x 0 x 0 x 0 x 0 x there are 8 such places so # of ways = 8c5 = 56
OpenStudy (anonymous):
u are awesome. please do stay on this page. ty
OpenStudy (nurali):
Welcome to Openstudy.
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