Who is Affirming the Consequent?

"Affirming the consequent" is when someone thinks if A happens, then B happens, and then sees B happen, so they believe A must have happened, but that might not be true.

How It Works in Real Life

Imagine you have a toy robot. You know this: if you press the red button, the robot dances. That's your rule, press redrobot dances.

Now, one day, you see the robot dancing. You think, "Oh, the red button must have been pressed!" But what if someone else pressed the green button by mistake, and the robot still danced? Then you're affirming the consequent, you saw the dance (B), so you thought the red button was pressed (A), but maybe it wasn't.

A Little Like Guessing a Recipe

It's like seeing your mom make cookies and thinking she must have used chocolate chips, just because that’s how you make them. But maybe she used raisins instead, you didn’t see her do it!

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Examples

  1. If it rains, the ground gets wet. The ground is wet, so it must have rained.
  2. If you study hard, you pass the test. You passed the test, therefore, you studied hard.
  3. If a dog barks, it is happy. This dog is happy, so it must be barking.

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Categories: Technology · logic· fallacies· reasoning