Among 120 freshman at a college, 40 of them take mathematics, 50 of them take English, and 15 of them take both mathematics and English. Find the number of the freshman who: (a) Did not take mathematics (b) took mathematics or English (c) took mathematics, but not English (d) took English, but not mathematics (e) took exactly one of the two subjects (f) took neither mathematics nor English.
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Within each chasing arrows triangle, there is a number which ranges from one to seven. The purpose of the number is to identify the type of plastic used for the product, and not all plastics are recyclable or even reusable. There are numerous plastic-based products that cannot break down and cannot be recycled.
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