Question

an online coupon service has 8 offers for free samples. how many different requests are possible if

A: a customer must request EXACTLY 2 free samples.
B: a customer must request UP TO 2 free samples.

Answer 1

A: The number of combinations of 8 offers taken 2 at a time is\[8C2=\frac{8!}{6!2!}=\frac{8\times 7}{2}\]
B: Multiply the answer to A: by 8.

Answer 2

B is wrong :/

Answer 3

B: Try adding 8 to the answer to B:

Answer 4

nooooo ;(

Answer 5

Maybe I don't understand the question. There are 8 ways of using the offers taken 1 at a time. There are 28 ways of using the offers taken two at a time.