Li's English book weighs 3 pounds, her math book weighs 5 pounds, her history book weighs 4 pounds, and her science book weighs 6 pounds.How many different combinations of one or more books can Li pack in her backpack so that the total weight of the books is 12 pounds or less?
  1. 9
  2. 10
  3. 11
  4. 12
  5. 18
Explanation
Answer: C - 11
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