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2015-11-12T03:22:20+05:30

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If there are  N students,  the rank of the 1st student is 1 from beginning and N from the last.  This is an example to find the following rule:

The number of students = rank of a student from beginning + rank from last  - 1
     Here    number of students = 17 + 15 - 1 = 31

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