Doubt from harmonic progression

2

Yes please share solution

Write b=2ac/(a+c)
Expand fraction,you get 2

Just divide ab from numerator and denominator from 1st one and bc from second one you will get (1/b+1/a)/(1/a-1/b) +(1/c+1/b)/(1/c-1/b) then use the fact that 1/a,1/b,1/c in AP with common difference d then you will get the answer

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