1. The problem statement, all variables and given/known data All the terms of the arithmetic progression u1,u2,u3...,un are positive. Use mathematical induction to prove that, for n>= 2, n is an element of all positive integers, [ 1/ (u1u2) ] + [ 1/ (u2u3) ] + [ 1/ (u3u4) ] + ... + [ 1/ (un-1un) ] = ( n - 1 ) / ( u1un) 2. Relevant equations 3. The attempt at a solution I proved that P(2) is true. However, I tried to prove that P(K+1) is true but to no avail. Thanks.