The figure below shows the front and rear view of a disc, which is shaded with identical patterns. The disc is flipped once with respect to any one of the fixed axes 1-1, 2-2 or 3-3 chosen uniformly at random. What is the probability that the disc DOES NOT retain the same front and rear views after the flipping operation?

For a regular polygon having 10 sides, the interior angle between the sides of the polygon, in degrees, is

Which one of the following numbers is exactly divisible by $\left(11^{13}+1\right) ?$