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Q: A alone can finish a work in 3 days. B alone can finish this work in 7 days. If A and B work together for 2 days, then what part of work will be left?
  • A. 1/7
  • B. 4/21
  • C. 2/21
  • D. 1/21
Correct Answer: Option D -
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Explanations:

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