Solution to Exercise 2.1-1"Find the Mistake"

The binomial coefficient in Hayes and Stoneham is written as
PL  =  N!
(N  –  n)!
The correct formula, of course, is
PL  =  N!
(N  –  n)! · n!
This is obviously a typo, otherwise one set of brackets would not have been necessary.
The final result is correct anyway, because the next equation (3.5) contains the complete formula.

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