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Take n = 3 and (i1,i2,i3) = (5,6,7)
5,6,7: i1*i2 + i2*i3 + i3*i1 = 30 + 42 + 35
5,7,6: i1*i2 + i2*i3 + i3*i1 = 35 + 42 + 30
6,5,7: i1*i2 + i2*i3 + i3*i1 = 30 + 35 + 42
etc ...
They are all the same so divide by n! to get the average.
queries can occur at any time and experienced individuals can only sort out those issue such as online signature. Institutions like airslate.com/product/analytics has set up a question answer seminar every week. This will eliminate any kind of doubts in pupils mind regarding this matter.