Ina class Rajan got the 11th rank and he was 31st from the bottom of the list of boys passed. Three boys did not take the examination and one failed. What is the total strength of the class?
Rank of Rajan from top = 11th
Rank of Rajan from bottom = 31st
=> Total number of students who attended exam = 11 + 31 - 1 = 41
It is known that 3 boys did not take the examination and one failed
=> Total strength of class = 41 + 3 + 1 = 45
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