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?

Question

BrainForge Quiz · Accepted Answer

C) 6. 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.

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?

✓ Correct Answer: Option C

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