Insertion of HP's between 2 numbers

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Q. If m is a root of the given equation $(1-ab)x^2-(a^2+b^2)x-(1+ab)=0$ and m harmonic means are inserted between a and b, then the difference between the last and the first of the means equals

1. b - a
2. a(b - a)
3. ab(b - a)
4. ab(a - b)

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