#1896 · Probability · Conditional probability
Coins Distributed in Purses Part 2
If coins have been distributed into purses, into each, find what the chance becomes when purses have been examined and found not to contain either of the specified coins.
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XXXII. Probability, Examples XXXII.d, No. 17 (part 2)
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).