An exam consists of nine true-or-false questions. Assuming that every question is answered, in how many different ways can a student complete the exam? In how many ways may the exam be completed if a penalty is imposed for each incorrect answer, so that a student may leave some questions unanswered?

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Q: The employees of a company are given a 4-digit identification number. How many different numbers are…

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Q: license plates contain 3 letters followed by 4 digits. a. how many license plates are possible? b.…

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Q: A group of five students studying for a bar exam has formed a study group. Each member of the group…

A: Permutation:   A permutation is an arrangement of objects in a definite order.   Let n is the total…

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A: By the fundamental counting principle, the number of ways to happens more than one independent event…