ELI5:when you know for sure how things work and what is true in an area: like you know things about triangles or addition, or even numbers under 40 and over 0. Then you can use deduction because you know the rules of the domain. Triangles have three corners and three sides no more no less… the new shape has 4 corners and 3 sides (some how) so it is not a triangle (since it breaks a rule you know for certain.)
On the other hand, when you know some examples, even a lot of examples, but you do not know for certain the forces at work then you cannot deduce. The universe is bigger than your knowledge set. So then you use inductive reasoning: which works, until it does not: “The farmer feeds me every morning… This is a morning… Hey Farmer, I wonder how I’m supposed to eat an axe?!”
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