Of 30 applicants for a job, 14 had at least 4 years' experience, 18 had degrees, and 3 had less than 4 years' experience and did not have a degree. How many of the applicants had at least 4 years' experience and a degree.
The set of 30 applicants is a square.
Applicants who have less than four years experience and also have no degree are outside both the circles. = 3 applicants.
Left circle denotes the number of applicants with at least 4years experience = A.
Right circle denotes the number of applicants with degrees = B.
Now number of applicants in both the circles should be 30 - 3. ie 27.
This 27 is equal to A + B - A intersection B.
We have to find A intersection B.
27 = 14 + 18 - A intersection B which gives A intersection B as 5
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