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Q.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:
Q.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 rst two questions;
(b) the rst or second question, but not both;
(c) exactly 3 out of the rst 5 questions;
(d) at least 3 out of the rst 5 questions.
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