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This question asks us to make 16 combinations, using red, green, white and blue cups and saucers. In order to do this question, start with one colour. Take white, for example. A white cup can be with a white, red, green or blue saucer. 4 combinations done. Now pick another colour. Let's take blue.A blue cup can match with a green, red, blue and white. Now 8 combinations done. Now pick red. A red cup can match with a blue, green,white and red saucer, which leaves us with a green cup, which matches with a green, white, red and blue saucer.16 combinations completed.