The diagram shows a regular decagon. work out the size of the exterior angle.

Im literally having a mental breakdown

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?

Which image (a’ b’ c’ d’) of abcd cannot he produced using only reflections ?