BOOKS IN SHELF

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Dhanu had been to the NEW YEAR PARTY, she had got some gifts to her friends and even her friends had bought books as a new year present, as she is a book lover. After returning from the party, Dhanu has to arrange the books in shelf(single row shelf) which is of length $N$ cm. Let $M$ be the number of books that she got as a present. Assuming, that the width of each book is $3$ cm. How many books

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