Question

Compute P(7,4).Multiple choice:a. 35b. 28c. 210d. 840e. none of these choices

Answer 1

The correct answer is d. 840

The problem ask us to compute the permutations of 7 objects in groups of 4.

To compute this, we use the formula:

`P(n,r)=(n!)/((n-r)!)`

Then for P(7,4):

`P(7,4)=(7!)/((7-3)!)=(5040)/(3!)=(5040)/(6)=840`

Then P(7,3) = 840