The area of the triangle is (12 * 6)/2 = 36.

The area formula for a triangle is 1/2 * bh.

We already know the base; it is XY, which is 12.

So, 1/2 * 12 * h is less than or equal to 24.

This is only true when h is less than or equal to 4, in which the altitude from D to XY is less than 4.

So, the area of the triangle that does not satisfy this condition has height 2 and base 4, which works out to an area of 4.

So, the chance of faliure is 4/36 = 1/9, and **the chance of success is 1 - 1/9 = 8/9.**