SOLUTION: There are 325 students in a college who have taken a course in calculus, 218 who have take a course in discrete mathematics, and 144 who have taken a course in both calculus and di

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Question 589915: There are 325 students in a college who have taken a course in calculus, 218 who have take a course in discrete mathematics, and 144 who have taken a course in both calculus and discrete mathematics. How many students at this college have taken a course in either calculus or discrete mathematics?
Answer by Edwin McCravy(20056) About Me  (Show Source):
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There are 325 students in a college who have taken a course in calculus,
N(C) = 325

218 who have take a course in discrete mathematics,
N(D) = 218

and 144 who have taken a course in both calculus and discrete mathematics. 
N(C and D) = 144

How many students at this college have taken a course in either calculus or discrete mathematics? 
N(C or D) = ?

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The formula is:

N(C or D) = N(C) + N(D) - N(C and D)

N(C or D) =  325 +  218 - 144

N(C or D) =  399   

Edwin