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MathNet 2017-part-04 — 176 problems (EN–VI) Question 62

Math Olympiad Vault · MathNet 2017-part-04 — 176 problems (EN–VI)

Question 62

Dominic randomly picks between two words MATHEMATICS and MEMES, each with an equal chance of popping up. From his chosen word, he then randomly draws one letter, with the probability of each letter popping up directly proportional to the number of times it occurs in the word. Given that Dominic drew an M, what is the probability that he, in fact, picked MEMES?