Let Ts be the total and s be the number of elements in set S Let Tt be the toal and t be the number of elements in set T given Ts = Tt Is s > t ? pre-requisite : Avg = (Total)/number of elements Stat 1: Avg of S < Avg of T Ts(s) < Tt(t) but given Ts=Tt. Cancel them out . hence s < t. sufficient Stat...