Question

Which example below uses deductive reasoning?

A.
using a pattern of dates to predict the next occurence of an event
B.
making a conjecture about triangles based on 3 examples
C.
creating the rule 3x+12 to describe a sequence of numbers
D.
declaring that squares have a certain property given that parallelograms have the same property

Answer 1

Deductive reasoning is one that necessarily follows, not one that likely follows (this would be an inductive reasoning).

Here the important information is that all squares are also parallellograms, which means that they also necesarily have all the properties of the parallelogram - the correct answer is D.