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A test consists of 10 multiple choice ...

A test consists of 10 multiple choice questions . In how many ways can the test be answered if
(i) Each question has four choices ?
(ii) The first four questions have three choices and the remaining have five choices ?
(iii) Question number n has n + 1 choices ?

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PREMIERS PUBLISHERS-COMBINATORICS AND MATHEMATICAL INDUCTION-EXERCISE 4.2
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