of 12 different books a shelf will hold five ; how many different arrangements may be made on the shelf ??
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of 12 different books a shelf will hold five ; how many different arrangements may be made on the shelf ??
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Answer:
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Answer:
Number of arrangemnets = C(12, 5) × P(5,5)
= P(12, 5)
= 12! / 7!
= 12×11×10×9×8
= 95040