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medium · GMAT Quantitative Reasoning

In a project with 100 tasks, 50 are Priority A, 40 are Priority B, and 30 are Priority C. 20 tasks are both A and B, 15 are both B and C, and 10 are both A and C, while 5 tasks are in all three priorities.

How many tasks have none of these priority designations?

  1. 45
  2. 15
  3. 20
  4. 30
  5. 25

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