The problem is this:
- set A has 12 items
- set B has 23 items
Taking 4 items from set A and 3 items from set B, what is the number of possible selections?
(Order matters).
I found this: Permutation problem, combining objects from multiple sets
Which would suggest that the answer is P(12,4) x P(23,3) x (4 + 3)!
Is that correct? I'm struggling to understand why the x (4 + 3)! is necessary.
$\endgroup$ 5 Reset to default
