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Option 2 : 2012

Difference between the numbers of students in year 2010 = 600 – 500 = 100

Difference between the numbers of students in year 2011 = 750 – 700 = 50

Difference between the numbers of students in year 2012 = 900 – 500 = 400

Difference between the numbers of students in year 2013 = 750 – 480 = 270

The absolute difference between the numbers of students in two schools is the highest in year 2012.
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