Study the following information and answer the question: Five persons like different colors and are arranged one after another. Only two persons come ...

Study the following information and answer the question: Five persons like different colors and are arranged one after another. Only two persons come after the one who likes red. There is exactly one person between D and the one who likes red. The number of persons after D is equal to the number of persons before the one who likes white. The person who likes purple is positioned before the one who likes white and after the one who likes yellow, but not immediately after yellow. O is placed before L and after M, who does not like green. K is positioned between M and O.

Question: How many persons are there after M?