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36. There are 40 students in the Travel Club. They discovered that
17 members have visited Mexico, 28 have visited Canada, 10
have been to England. 12 have visited both Mexico and
Canada, 3 have been only to England, and 4 have been only to
Mexico. Some club members have not been to any of the three
foreign countries, and, curiously, an equal number have been
to all three countries.
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(a) How many students have been to all three countries?
(b) How many students have been only to Canada?