# Statistics

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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?

• Statistics -

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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