A First Course in Probability (10th Edition)
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ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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Show that for the simple random walk starting at zero,
P(first visit to S^(2n) occurs at t = 2k) = P(S_(2k) = 0) · P(S_(2n−2k) = 0)
for 0 ≤ k ≤ n.
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