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    Question

    In how many ways can 4 books to be kept in 2 shelf, if

    any number of books can be kept in all of the two shelfs?
    A 25 Correct Answer Incorrect Answer
    B 16 Correct Answer Incorrect Answer
    C 256 Correct Answer Incorrect Answer
    D 64 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    For every books, there are 2 shelfs as options. We can put 1st books in any of the two shelfs, similarly we can put 2nd books in any of the two shelfs again and so on. So we can kept 4 shirts in 2 shelfs in 4 × 4 = 42 = 16 ways

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