In how many ways can 6 different books be arranged on a shelf if only 3 of them are chosen and the order matters?

Answer and explanation

Correct answer: B. 120

  1. Step 1: Arrangements of items from : . Step 2. . Answer: 120. Why not the others: 20: That ignores the order of the books. 216: That would allow repeats. 18: That multiplies and .

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