posted by ng on .
In a survey of a TriDelt chapter with 50 members, 21 were taking mathematics, 33 were taking English, and 6 were taking both. How many were not taking either of these subjects?
N(M or E) = N(M) + N(E) - N(M and E)
= 21 + 33 - 6 = 48
but 50 were surveyed
so 2 did not take either Math or English