In an exam, a student is required to answer 10 out of 13 questions. Find the number of possible choices if the student must answer: (a) the first two questions; (b) the first or second question, but not both; (c) exactly 3 out of the first 5 questions; (d) at least 3 out of the first 5 questions.
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(a)
(b)
(c)
(d)