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(a1+a2+....+am )2
If you mean a2+b2 = c2 then it's Pythagoras' theorem
n/(1/a1+1/a2+....+1/an)
It is an expression and a term that are of equal value
"Average" as in arithmetic mean is equal to (a1 + a2 + a3 + ... + an)/n, where ai are elements of a set.