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Find the probability using binomial distribution.

It is known that 60 percent of all registered voters in the 42nd congressional District are Republicans. There registered voters are selected at random from the district. Compute the probability that exactly 2 of the 3 selected are Republicans, using
[a] The rules of probability
R, R, NR=
R, NR, R=
NR, R, R=
[b] The binomial formula
[c] Calculate the variance of a binomial distribution.

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