Question 1127127
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To add to the response by tutor @ikleyn....<br>
The answer to part b can't be 1 - 2.7557*10^-7.  That would make the sum of the answers to parts a and b equal to 1.<br>
That would imply that the only possible outcomes are each person getting his own name or no people getting their own names.  That leaves out the large number of outcomes where some but not all of the people get their own names.