# Probability of Envelopes

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Three envelopes are addressed for 3 secret letters written in invisible ink. A secretary randomly places each of the letters in an envelope and mails them. What is the probability that at least 1 person receives the correct letter?

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##### Solution Summary

This is a probability problem regarding randomly mailed letters. The solution explains how to solve the problem and shows the answer through step by step calculation.

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Suppose 3 envelopes are denoted as A, B, C and the 3 secret letters are denoted as a, b, c. They should be put in envelopes A,B,C, ...

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