#1813 · Probability · Conditional probability
Two-headed shilling
A man has 10 shillings and one of them is known to have two heads. He takes one at random and tosses it 5 times and it always falls head: what is the chance that it is the shilling with two heads?
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XXXII. Probability, Examples XXXII.d, No. 6
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).