Posted by **Jack** on Sunday, January 5, 2014 at 10:26pm.

Meenah made a conjecture that any even number will be divisible by 4. Test her conjecture. Explain whether it is correct or incorrect.

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**Reiny**, Sunday, January 5, 2014 at 10:34pm
Meenah conjecture is either true or false

Assume that it is true, that is, all even numbers are divisible by 4

test some

8/4 = 2 , ok

24/4 = 6

10/4 = 2.5, not exact

Since we assumed it to be true and I found a case which was false, my assumption must have been false.

Since the conjecture is either true OR false, and my assumption that it was true showed up to be wrong, it must be false.

(All we really needed was one single exception)

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