Math problem formula please?

Question

lou makes sandwiches with white or wheat bread only. each sandwich comes with one slice of cheese. choices are american,swiss,cheddar,and mozzarella. how many different combos are there? formula please?

Answer 1

So the formula is nCr=n!/r!(n-r)!   Unfortunately, I got a C in Algebra II last year, so I'm afraid of doing this problem and giving you the answer, because I will probably get it wrong.

Answer 2

2(types of bread)*4(types of cheese)=8(combos)