easy · GMAT Quant

Two independent automated quality control checks are performed on a manufactured component. Each check has a probability of 0.70 of successfully detecting a defect if one exists.

What is the probability that at least one of the two checks successfully detects a defect?

  1. 0.91
  2. 0.49
  3. 0.70
  4. 0.79
  5. 0.98

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