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We are given a table with data of 67 members of the US Senate in June 2012 and their affiliated political party and when they

We are given a table with data of 67 members of the US Senate in June 2012 and their affiliated political party and when they are up for reelection.

Up for re-election: Democratic Party Republican Party Other
November 2014 20 13 0
November 2016 10 24 0

1) What is the probability that a randomly selected senator is up for reelection in November 2016?

2) What is the probability that a randomly selected senator is a Republican or is up for reelection in November 2014?

3) Suppose that a member of the US Senate is randomly selected. What is the probability that the senator is up for reelection in November 2014, knowing that this senator is a Republican?

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