P(less than 2 red light) = P(0 red light hit) + P(1 red light hit)
= 0.2 + 0.15
= 0.35
Hence, 0.35 is the probability that you hit less than 2 red lights on your commute.
Please comment if any doubt. thank you.
The number of red lights you hit on your drive to work is a random variable...
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