- #1
sebastianbravom
- 3
- 0
Homework Statement
in how many different ways can 7 different books be arranged in a row if
a. 3 specified books must be together,
b. two specified boks mus occupy both ends
Homework Equations
i don't udnerstand wether it is a permutation or a combination.
The Attempt at a Solution
a. 4! x 7!
b. 7 x 5! x 6