Mathematics · Probability
Two discrete-time random walkers start from the point x = 0 at time t = 0 taking discrete steps of unit length along the x-axis. The first walker is unbiased and the second walker is biased to move towards the right with probability p. The probability that they are at a distance of 2 units from each other at both time steps t = 1 and t = 2 is:
- 1p2
- 21 - 3p4
- 312 - p2
- 414✓
Correct answer
14
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