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For this probability problem, you'd have a one-in-four chance of being correct if you guessed the answer at random.

Two gears in a system rotate in opposite directions. What happens when you add another gear?

Distinguishing between true and false statements can help us get to other information, too. Which chests have gold in them?

There are lots of ways to add to nine, but is it possible to make it happen twice in this puzzle?

Even without knowing the measure of any one angle, we can sometimes find relationships between them. What are these angles?

When static friction fails, how many books will land on your hand?

Mathematics is the art of reasoning about patterns, and not all patterns are numerical. What completes this pattern?

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