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10-129.

An engineer is designing the operator panel for a water treatment plant. The operator will be able to see four LED lights in a row that indicate the condition of the water treatment system. LEDs can be red, yellow, green, or off. How many different conditions can be signaled with the LEDs? Homework Help ✎

Use a decision chart. See the Math Notes box in Lesson 10.3.1 for an example.