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Assertion A : If ax^2+ 2hxy + by^2 = 0 r...

Assertion A : If `ax^2+ 2hxy + by^2 = 0` represents two straight lines whose one slope is thrice the other then `3h^2 = 4ab` Reason R: If `ax^2 + 2xy + by^2 = 0` represents two lines and whose slopes are `m:n` then `(m+n)^2/(4mn)=(ab)/h^2`

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