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Permutation: n Different Things Taken r at a Time

A letter is k...

Question

A letter is known to have come either from London or Clifton; on the postmark only the two consecutive letters ON are legible; what is the chance that it came from London?

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Solution

The consecutive letter 'ON' appears twice in London while once in Clifton
Total outcome $= 3$
P(London) $= \frac{2}{3}$

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