Three are 50 students in a class who are given a test with three questions on it say Q1, Q2 and Q3. All the students answer at least 1 question. If 12 students did not answer Q1, 14 did not answer Q2, 10 did not answer Q3 and 25 answered all 3 questions, then how many students answered exactly 1 question? Provide proper steps.

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