How many unique states can you create with combinations of three lights? Go!

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​ This week’s developer challenge: You have three lights—red, green, and blue. Each light can be ON or OFF. Your task? Use these lights to signal exactly 7 unique commands. Here’s a bonus to stretch your thinking: If you needed to signal N commands, how many lights would you need?

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Speaker: M.E Francis   Read More Google for Developers