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Apr 24th, 2018
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  1. `A = Table[0, {1}, {2}];
  2. Do[
  3. x = RandomReal[];
  4. Which[
  5. x < 0.25, A[[i + 1, 1]] = A[[i, 1]] + 1;
  6. x < 0.25, A[[i + 1, 2]] = A[[i, 2]] - 1],
  7. {i, 1, 0}, {i, 1, 1}]
  8. ListLinePlot[A]`
  9.  
  10. ListLinePlot[Accumulate@RandomChoice[{{1, 0}, {-1, 0}, {0, 1}, {0, -1}}, 500]]
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