Logical Connundrums (interesting stuff)

[Raskolnikov]

This thread is about logical connundrums. I will post some logical connundrums I know and let's see if you have an answer to them (If the connundrum can even be satisfatorily answered in first place ;D) Also, if you have some logical connundrums you want to post yourself then by all means do so. Here we go:


-A man points to another man and says, "No brothers or sisters have I, but that man's father is my father's son." What is the man's relationship?

-If God can do anything can he make a rock so heavy that He Himself can never lift?

-A man walks up to another man and hands him a slip of paper. On the front of the paper reads "The message on the other side of this paper is false" the man then flips it over and finds that on the back of the paper there is a message that states, "The message on the other side of this paper is true." How does he know which statement is true?

[dark shadow]

step brother?

[Darkmaterials]

-A man points to another man and says, "No brothers or sisters have I, but that man's father is my father's son." What is the man's relationship?

The first man is the second mans father.


-If God can do anything can he make a rock so heavy that He Himself can never lift?

I guess you could say that he can and can't lift the rock, there's probably a better answer though lol.


Edit: Is the answer that "can never lift" could also mean that he is able to lift it, but he is also able to not lift it.

So he is able to never lift it.

-A man walks up to another man and hands him a slip of paper. On the front of the paper reads "The message on the other side of this paper is false" the man then flips it over and finds that on the back of the paper there is a message that states, "The message on the other side of this paper is true." How does he know which statement is true?

Is this one unanswerable or something? Or are they both true and false?

Lets say the front = 1 and the back = 2.

If 1 is false it means 2 is true.
That makes 1 true, which makes 2 false.
That makes 1 false, which makes 2 true.

Repeat...