"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 red → robot 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
Examples
- If it rains, the ground gets wet. The ground is wet, so it must have rained.
- If you study hard, you pass the test. You passed the test, therefore, you studied hard.
- If a dog barks, it is happy. This dog is happy, so it must be barking.
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See also
- What are chain-of-thought errors?
- What are logical errors?
- How Does A Very Basic Introduction to Logic and Syllogistic Logic Work?
- How Does Aristotelian Logic Work?
- How Does 03-7-05 Cogent Arguments - An Example Work?