Two ants walk on a line in a random fashion. They begin 10cm apart. At each time step, each ant has a probability of 1/2 to move 1cm to the left, and probability 1/2 to move 1cm to the right. What is the probability that after 7 time steps, the ants have met one another (i.e., passed through the same point)?
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I don't know this answer because I want to earn points sorry for writing this post
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