Please check over my answer for a) and and answer b) please and show your full work thanks

5) Did you ever eat in Northern's caf? There's a reason why it shut down. Here's why: Last year's typical leftovers included 2 over-dressed caesar salads, 8 moldy tuna sandwiches, 7 slices of pepperoni cardboard pizza, and an overcooked hamburger. a) How many different purchases could Dov have made assuming he ordered something? [A 2 ] 18 's = 18! / ( 18- 5 )! = 18!/ 13! = 1, 028, 160 b) How many different purchases could Dov have made assuming his order must have included at least two pizza slices and exactly one salad? All other items are optional [A 2