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a person down the road sees 2 stop lights ahead. Each light can each be either red (R), yellow (Y), or green (G).

which list shows all the possible combinations for the two lights?

RR, RY, RG, YR, YY, YG, GR, GY, GG

Did you know?

Did you know that when a person sees two stop lights ahead, there are actually 9 possible combinations for the lights? Each light can be either red (R), yellow (Y), or green (G), resulting in a myriad of potential combinations. These combinations include RR (both lights are red), RY (the first light is red and the second is yellow), RG (the first light is red and the second is green), YR (the first light is yellow and the second is red), YY (both lights are yellow), YG (the first light is yellow and the second is green), GR (the first light is green and the second is red), GY (the first light is green and the second is yellow), and GG (both lights are green). It's fascinating how these combinations can create different signals and convey various meanings on the road. Stay alert and drive safely!