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Suppose a True-False test has 20 questions.
a) In how many ways may a student mark the test, if each question is answered?
b) In how many ways may a student mark the test, if 7 questions are marked correctly and 13 incorrectly?
c) In how many ways may a student mark the test, if 10 questions are marked correctly and 10 incorrectly?

Sagot :

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