Respuesta :

mhanifa

Answer:

  • 2520

Step-by-step explanation:

This is permutation question

The formula for it:

  • N = b!/(b-s)!, where N- number of ways, b- number of books, s- number of slots

Finding the answer:

  • N = 7!/(7-5)! = 7!/2! = 7*6*5*4*3 = 2520

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