Permutation and Combination

Calculate P (12, 4).

• 40 320

• 11 880

• 990

• 495

If P (9, r) = 504, what is r?

• 7

• 6

• 5

• 3

If x = P (7,4), y = P (8,4) , and z = P (9, 3) , arrange x, y and z from the smallest to greatest.

• x, y, z

• z, x, y

• y, x, z

• x, z, y

Which of the following can be a value of r in C (15, r) = 1365?

• 6

• 5

• 4

• 3

In how many different ways can seven potted plants be arranged in a row?

• 5 040

• 2 520

• 720

• 210