Lemma
EasyCounting & chance
#1816 · Probability · Counting & chance

Contradicting the same fact

speaks the truth 3 out of 4 times, and 5 out of 6 times: what is the probability that they will contradict each other in stating the same fact?

~5 minAnswer checked instantlyindependent eventsprobability rules

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XXXII. Probability, Examples XXXII.d, No. 10

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Type naturally — sqrt, pi, / and ^ become notation. Any equivalent form is accepted. Press Enter to check.

Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).