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Academic services survey. The Dean of Academic Services surveyed a group of students about which support services they were using to help them improve their academic performance and found the following results:
5 were using office hours, tutoring and online study group to improve their grades.
16 were using office hours and tutoring.
28 were using tutoring.
14 were using tutoring and online study groups.
8 were using office hours and online study groups but not tutoring.
23 were using office hours but not tutoring.
18 were using only online study groups.
37 were using none of these services.
a. How many students were surveyed?
b. How many students were using only office hours?
c. How many students were using online study groups?
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