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Necessary and Sufficient Conditions

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Storyboard Description

causation - cause and effect - Root Cause analysis

Storyboard Text

  • Neither Necessary, nor Sufficient
  • HELLO!
  • Sufficient, but not Necessary
  • Being human means you can talk. (Some birds can speak, and some humans cannot)
  • Necessary, but not Sufficient
  • Causation
  • The sidewalk is wet because it's raining. (The sidewalk could get wet from some other cause, a hose, for instance.)
  • Necessary and Sufficient
  • You have to be 30 years old to serve as a US Senator. (Being 30 is not enough to make you a senator though.)
  • Lighting causes thunder. (Thunder cannot be caused by anything other than lightning.)
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