IIT-JEE Exam

If the sum of first n terms of an A.P. is cn2, then the sum of squares of these n terms is?

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IIT-JEE Other Question

A line with positive direction cosines passes through the point P(2, - 1, 2) and makes equal angles with the coordinate axes. The line meets the plane 2x + y + z = 9 at point Q. The length of the line segment PQ
equals?? The tangent PT and the normal PN to the parabola y^2 = 4ax at a point P on it meet its axis at points T and N, respectively. The locus of the centroid of the triangle PTN is a parabola whose??