Posted by **barbara** on Saturday, June 6, 2009 at 11:52am.

Indicate whether the deductive reasoning used is an example of affirming the hypothesis or denying the conclusion.

If a number is divisible by 3, then the sum of the digits of that number is divisible by 3.

The sum of the digits of a number is not divisible by 3. Therefore the number is not divisible by 3.

- teaching math -
**bobpursley**, Saturday, June 6, 2009 at 12:03pm
The fallacy of affirming the hypothesis is based on the following hypothesis:conclusion set

If A then B, IF B then A.

The fallacy of denying the conclusion is

If A, then B; If NOT B, then NOT A

Does that help?

- teaching math -
**bobpursley**, Saturday, June 6, 2009 at 12:04pm
If you are teaching Math, the way to teach these is to demonstrate with Venn Diagrams, in my opinion. STudents understand spacial arguments better than written logic.

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