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A traffic cop has been determined that (2 %) of drivers checked to use their mobile...

A traffic cop has been determined that (2 %) of drivers checked to use their mobile phones and (8 %) of drivers checked do not wear seat belts. In addition, it has been observed that the two infractions are independent of one another. If the cop stops seven drivers at random:
a. Calculate the probability that exactly five of the drivers have committed any one of the two offenses.
b. Calculate the probability that at least one of the drivers checked has committed at least one of the two offenses.

There is a trick in the question header that I could not figure out. I have downloaded this question several times in this program but everyone answers it wrong. I hope someone can discover the trick in question and help me find out the answer.

Math   Statistics-And-Probability   
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