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  • So let's look at an example of deductive reasoning. So Premise A, is all mass

  • creates gravity. And Premise B, is all objects have mass. Therefore, all

  • objects create gravity. Because if all mass has gravity and all objects have

  • mass, then they must create gravity. Notice that the logical conclusion has to

  • be true if the 2 premises are true. We know, however, that this type of

  • reasoning can lead to correct conclusions only when the general premises to

  • which they are based are true. Let's look at another example. Premise A,is I

  • don't know math. Premise B is, I can't learn math. Therefore, I shouldn't even

  • bother trying to learn math". We see, here, that this reasoning leads to a

  • false conclusion, because premise A is false. And so is premise B. So, even

  • though the argument is. Easily structured in the same way. One leads to an

  • accurate conclusion, and one, this one, does not. Deductive reasoning is what

  • scientists use when we make predictions for our general goals. Now let's go to

  • Susan and talk about inductive reasoning.

So let's look at an example of deductive reasoning. So Premise A, is all mass

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