A store has a sale on 5 items priced $10, $20, $30, $40, $50. A customer buys exactly 3 it

A) 4

B) 5

C) 6

D) 7

Explanation

All C(5,3)=10 combos. List sums: {10,20,30}=60 ✓, {10,20,40}=70 ✓, {10,20,50}=80 ✓, {10,30,40}=80 ✓, {10,30,50}=90 ✓, {10,40,50}=100 ✗, {20,30,40}=90 ✓, {20,30,50}=100 ✗, {20,40,50}=110 ✗, {30,40,50}=120 ✗. Valid: 6.

Practice More General Knowledge Questions

A store has a sale on 5 items priced $10, $20, $30, $40, $50. A customer buys exactly 3 items. The total must be at least $60 but not more than $90. How many valid combinations exist?

Explanation