Hard
Bird Riddle
A fast-food restaurant sells chicken in orders of 6,9 and 20. What's the largest number of pieces of chicken you cannot order from the restaurant?
Choose an answer
A.41
B.45
C.50
D.43 is the last number that doesn't fall into these categories.
Answer: 43 is the last number that doesn't fall into these categories.
This is the Chicken McNugget/Frobenius problem: 43 is the largest number that cannot be formed as a non-negative combination of 6, 9, and 20.