A computer monitor manufacturer produces 7 different models, all with a different selling price. Suppose that 4 different customers (call them A, B, C and D) will each purchase one of the monitors.
I just want to check my answers. If this is right or wrong.
In how many ways may this be done assuming that no two customers purchase the same model?
I did a sample space here. i assume that no two customers purchase the same model so i did like this . Customer A can purchase 7 different models. B can purchase 6 different models. C can purchase 5 different models. D can purchase 4 different models. Multiply them then i got 840 ways to do it.
In how many ways may this be done assuming that different customers may purchase the same model?
For this one, I got 5040 ways to do it because I 7!.? i honestly i am confuse in this part.