Question

A salad bar has croutons, raisins, bacon, sunflower seeds, and cranberries available as toppings. Roger wants 2 different toppings on his salad. How many possible 2 topping combinations can Roger choose? 10 combinations 20 combinations 25 combinations 18 combinations

Answer 1

Lets c croutons, r raisins, b bacon, s sunflower seeds and r cranberries:

5 toppings:

5C2= 5!/(2!(5-2)!)= 120/(2(3*2))=120/12= 10 combinations