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  1. ½
  2. ½
  3. Yes
  4. 1 – ¼·¼ = ¾
  5. 2 times
    Note that `2 = 1/½` is the infinite sum `1/2 * 1 + (1-1/2) * 1/2 * 2 + (1-1/2)^2 * 1/2 * 3 + (1-1/2)^3 * 1/2 * 4 + ...`