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Unformatted text preview: gives ( (1 ) 2 + (1 ) 3 ). The probability of reaching state P is the same, so the probability of 2 infections is twice this number. Similarly, the probability of reaching state R, corresponding to 3 infections, is 2 + 2 2 (1 ) + (1 ) 2 2 . The probabilities of reaching states P, Q, R, and S sum to one, since these are the only possible outcomes....
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- Fall '11