For this probability problem, you'd have a one-in-four chance of being correct if you guessed the answer at random.
4,887 people working on this
Two gears in a system rotate in opposite directions. What happens when you add another gear?
11,531 people working on this
Distinguishing between true and false statements can help us get to other information, too. Which chests have gold in them?
9,036 people working on this
There are lots of ways to add to nine, but is it possible to make it happen twice in this puzzle?
12,226 people working on this
Even without knowing the measure of any one angle, we can sometimes find relationships between them. What are these angles?
13,820 people working on this
When static friction fails, how many books will land on your hand?
Series 4 of 4
10,746 people working on this
Mathematics is the art of reasoning about patterns, and not all patterns are numerical. What completes this pattern?
14,094 people working on this