Match Answers with Problems

The upper two rows contain answers to the problems in the lower two rows. Click on an answer first, then on the problem. To remove a solution click first on a problem and then on an empty answer space. When finished check the "Pattern" button on the right to verify your answers. Two patterns will be shown. Your matchmaking was successful if the two patterns coincide. Check your answers otherwise.

(Now let's think about it. A set of exercises with a predefined set of solutions serves as its own verifier. To make it work smoothly start with the more difficult exercises and move towards the easier ones. If at some point you can't find a solution to match a problem, a mismatch must have occured earlier.)

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