ObjectiveMcq
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You are given infinite coins of denominations 5, 7, 9. Which of the following sum CANNOT be achieved using these coins?
Correct Answer: C — 13
One way to achieve a sum of 50 is to use ten coins of 5. A sum of 21 can be achieved by using three coins of 7. One way to achieve a sum of 23 is to use two coins of 7 and one coin of 9. A sum of 13 cannot be achieved.