JAMB - Mathematics (1989 - No. 40)

On the curve, the points at which the gradient of the curve is equal to zero are

c, d, f. i, l

b, e, g, j, m

a, b, c, d, f, i, j, l

c, d, f, h, i, l

The gradient of any curve is equal to zero at the turning points. i.e. maximum or minimum points. The points in the above curve are b, e, g, j, m