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Knowing how your opponent will play in a game allows you to make the best possible move. How is this game won?

As long as townsfolk need to cross the river, Galileo's ferry will be at their service. But can Galileo cross safely when the current is fast?

Looking at everything in this figure could get overwhelming. Instead, think about how it's built in steps.

To find the median of a data set, order the valuesâ€¦ but can you locate the median without the exact values?

In real-life collisions, objects lose energy. How does this fact limit the height of the top ball?

Use a combination of logic and arithmetic to find the middle row of this Calcdoku puzzle.

When angles appear in the same figure, their measures are related. We can use those relationships to find their exact values.

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