Mathematics, 25.02.2020 18:01 tony001

Among 41- to 46-year-olds, 31% say they have used a computerused a computer while under the influence of alcoholalcohol. Suppose six 41- to 46-year-olds are selected at random. a) The probability that at least one of the six randomly selected adults has not written an editorial letter while under the influence of peer pressure.
Correct answer = 1 - (28)^6 = 0.999518
(b) The probability that at least one of the six randomly selected adults has written an editorial letter while under the influence of peer pressure.
This is the example that I am having issues with. The answer given is = 0.8607. No matter how I've done the math, I cannot come to 0.8607. Details would be appreciated.

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Among 41- to 46-year-olds, 31% say they have used a computerused a computer while under the influenc...