#1810 · Probability · Conditional probability
Postmark probability
A letter is known to have come either from London or Clifton; on the postmark only the two consecutive letters ON are legible; what is the chance that it came from London?
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XXXII. Probability, Examples XXXII.d, No. 3
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).