1 a + w + 1 b + w + 1 c + w = 2 w 1 a + w 2 + 1 b + w 2 + 1 c + w 2 = 2 w 2 1 a + 1 + 1 b + 1 + 1 c + 1 = ?

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Please find below the solution to the asked query:

We have1a+ω+1b+ω+1c+ω=2ω1a+ω2+1b+ω2+1c+ω2=2ω2Hence ω,ω2 are roots of1a+x+1b+x+1c+x=2x...ib+xc+x+a+xc+x+a+xb+xa+xb+xc+x=2xxb+xc+x+xa+xc+x+xa+xb+x=2a+xb+xc+xxb+xc+x+xa+xc+x+xa+xb+x-2a+xb+xc+x=0Now above is cubic equation, let third root be α.Collect coefficent of x2Coefficient of x2=2a+b+c-2a+b+c=0Hence sum of roots=0α+ω+ω2=0α-1=0 As 1+ω+ω2=0α=1 which will satisfy i1a+1+1b+1+1c+1=2

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