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A psychologist had a random sample of 22 students.He grouped them into 11 pairs.In each pair,one student was taught by method A and other by method B and were examined after the completion of the course.The marks obtained by them are tabulated below :

 Pair : 1 2 3 4 5 6 7 8 9 10 11 A : 24 29 18 14 30 19 27 31 20 28 11 B : 37 35 16 26 23 27 19 20 15 11 21

Find the Kendall's rank correlation coefficient.

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