1.

tho aiven quontttie eqidistant ssieginning and the end is enalehtIlanenitent

Answer»

Let B,E be the constant beginning and end respectively and let b,e,d be variables for any of the two numbers and their equidistance from the beginning and end. Then:

b=B+d e=E−d

So the arithmetic mean is

b+e2=B+d+E−d2=B+E2

Which is constant.



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