John wrote 20 letters and found out that
of them have no mistakes, and Dina
wrote 28 letters and found out that
of them also don’t have any mistakes.
If a letter is selected randomly from all the written letters, determine the
probability of the letter having mistakes and being written by John.
The probability of event occurring is equal to the number of
favorable outcomes divided by the total number of possible
outcomes in the sample space, In this case, event is
selecting a letter with mistakes that has been written by John.
Find the probability of event as follows:
Thus, the probability of selecting a letter with mistakes that has
been written by John is