#1893 · Probability · Conditional probability
Sovereigns in a Purse Part 1
A purse contains four coins; two coins having been drawn are found to be sovereigns: find the chance that all the coins are sovereigns.
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XXXII. Probability, Examples XXXII.d, No. 14 (part 1)
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).