Question

of 12 different books a shelf will hold five ; how many different arrangements may be made on the shelf ??​

Answer 1

Answer:

don't understand this question

Answer 2

Answer:

Number of arrangemnets = C(12, 5) × P(5,5)

= P(12, 5)

= 12! / 7!

= 12×11×10×9×8

= 95040