Life is a Test: A Series of Pony Logic Puzzles

by Brony_of_Brody

The Answer 3

Remove all except one of the stones from the red jar and put them in the other jar.

If you choose the jar with the one red stone, you're now guaranteed to get a red one.

Odds of picking the jar with the one red stone: 50% (1/2)

If you choose the other jar, there's a 5/11 chance of picking one of the red stones from it.

Odds of picking that jar (1/2) x Odds of picking red stone from said jar (5/11) = 5/22 (approx 23%)

So adding the 2 probabilities, Cozy now has an about 73% chance of choosing a red stone.

Comments

[farsan]

And when the second, or the third, or the fourth, or the fifth, or the sixth student chooses a jar and says that it is empty and that they have to pick the other one, the jig would be up.

[Andy Ray]

9325813
So true! I'm not the only one, who thought so!