`{:(,"स्तम्भ 'अ'",,"स्तम्भ 'ब'"),(1.,lim_(x to 0)(x^(2)-1)/(x-1),(a),nx^(n-1)),(2.,lim_(x to 2)(x^(2)-5x+6)/(x^(2)-4),(b),-1//4),(3.,(d)/(dx)(x^(n)),(c ),1):}`

Answer

`1 to (c ), 2. to (b), 3. to (a)`.