Statistics
posted by john
In how many different ways can a chemistry book, a calculus book, a history book and a dictionary be arranged on a shelf so that the chemistry book or the history book appears first?

Reiny
you have 4 books
One of two specific books have to come first, after that it, it doesn't matter, so
number of ways = 2 x 3 x 2 x 1 = 12
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