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3. How many ways can you select 3 books froma collection of 7 books and then arrange themin s shelf?​.

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Sakura478viz

Answer:

210 ways

a combination of 3 different books from a collection of 7 can be picked by

  • 7 × 6 × 5 = 210

(pick the first book, then the second, then the third each time one is picked there are less books to chose from)

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