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Each person’s performance compared with all other persons is to be done to rank them subjectively.

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Each person’s performance compared with all other persons is to be done to rank them subjectively. How many comparisons are needed in total, if there are 11 persons? 

(a) 66 (b) 55 (c) 54 (d) 45

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(b) lst person is to be compared with the other 10 persons i.e 10 comparison. 2nd person is to be compared with the remaining 9 persons and so on. Hence, total no. of comparison = 10 + 9 + ...... + 1

asked Apr 27, 2019 by (40 points) what is the formula used please elaborate
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