Question: determine whether the following arguments are valid or invalid think...

Determine whether the following arguments are valid or invalid. Think of a counterexample in which premises are true and the conclusion is false.

1. I dreamed about my great-grandfather.

Dreams always contain some prophetic advice that always turns out to be true.

My great-grandfather said that there would be a huge flood that will wipe out New York City.

Therefore, there will be a huge flood that will wipe out New York City.

2. It is really easy to win a game of poker against a bunch of some really old people and amateurs.

I am playing a game of poker against some really old people and amateurs.

I will win this game of poker.