In a recent election there were 1000 eligible voters. They were asked to vote on two issues, A and B. The result were as follows: 300 people voted for A, 450 people voted for B, and 50 people voted for A and B. If one person is chosen at random from the 1000 eligible voters, find the following probabilities: 1) The person voted for A, given that he voted for B. 2) The person voted for B, given that he voted for A.

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