A bookbinder must bind 12 identical books using red, green or blue covers. In how many ways can he dothis?
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4*4*4=64 ways is answer
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About the books, envision that that the math books are set in a container, marked M. At that point we have 9 questions, the English books and the M.
These can be organized on the rack in 9! ways.
For every one of these ways, the math books can be removed from the case and orchestrated in 4! courses, for a sum of 9!4!.
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