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A librarian is arranging a thirteen-volume encyclopedia on the shelf from left to right in the following order of volume numbers : 8, 11, 5, 4, 9, 1, 7, 6, 10, 3, 12, 2. In this pattern, where should the volume 13 be placed ?
The books are kept in alphabetical order like eight, eleven, five, four and so on. Thus, thirteenth will lie between 10 and 3.