brynbaker
Answered

Select a counter-example that makes the conclusion false.
You select three marbles from a bag and each of them is black.
Conclusion: All the marbles in the bag are black.

Counterexample:

Answer :

trombonebookworm
A counter-example could be

There are more than 3 marbles in the bag, and the other ones are red.

Hope this helps!

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