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Which amount cannot be made from 4- and 5-dollar coins?
A9 dollars
B8 dollars
C11 dollars
D10 dollars
Answer & Solution
Correct answer: C. 11 dollars
9 is 4 + 5, 10 is 5 + 5 and 8 is 4 + 4, but no mix of 4s and 5s adds up to 11.
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