Problem Statement: ECE Board November 1992
The probability for the ECE board examinees from a certain school to pass the subject Mathematics is 3/7 and for the subject Communications is 5/7. If none of the examinees fails both subject and there are 4 examinees who pass both subjects, find the number of examinees from that school who took the examinations.
Problem Answer:
There are 28 examinees from a certain school who took the examinations.
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