Cyberchase: Lock Combinations
1m 46s
math
combinations and permutations
combinations

Matt and Jackie have three differently-colored keys and knobs. They need to use one combination of key and knob to open the door. They organize all of the available combinations into a grid of possibilities and calculate that they have 9 total combinations. As they attempt each combination, they mark down which combination was used until they find the working one.

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