#1894 · Probability · Conditional probability
Sovereigns in a Purse Part 2
A purse contains four coins; two coins having been drawn are found to be sovereigns: find the chance that if the coins are replaced another drawing will give a sovereign.
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XXXII. Probability, Examples XXXII.d, No. 14 (part 2)
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).