by Tom Fairman
Welcome back to a new year of puzzling. Each week we will be
releasing a Maths Puzzle that requires problem solving and logic for everyone
to have a go at. It may require a bit of research or to learn some new
techniques, but it will always be fun. Answers should be sent to t.fairman@pgs.org.uk and the correct
answer and working will be revealed the following week.
This week’s puzzle is:
A secretary types four letters to four people and addresses
the four envelopes. If he inserts the letters at random, each in a different
envelope, what is the probability that exactly three letters will go into the
right envelopes?
Happy puzzling
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