Difficult
In the proof of Theorem (4), I am not sure why "if Sn-S0=k, then r-s=k and r+s=n". Is k an arbitrary number? Also, in example (22), I am not sure how we get to the third step from the second step.
Reflective
This is the first time I learn about random walk, so it's a challenge for me. Although I can't understand the theorems in this section thoroughly, I think it's fun to learn about random walk; also, I think random walk is useful in the practical world.
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