Question

When Lucas goes to school, he passes two traffic lights. The probability of showing red is 70% and 80%. How likely is it that at least one of them shows green on the way to school?

Answer 1

0.44

Explanation:

the probability the first one she's green(0.3) plus the probability the second shows green(0.2) minus the probability both occur(0.06) equals 0.44.