from a point P tangents drawn to the circles x^2 + y^2 + x -3=0 ; 3x^2 + 3y^2 -5x +3y=0 :4x^2 +4y^2 +8x +7y +9=0 are of equal length. find the equation of circle through p which touches the line x +y= 5 at point (6,-1)

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane