Which colour is it then?

Logic Level 1

Mr. Robin asks his 5 students whether they studied maths yesterday.

White: "No one studied maths yesterday."
Brown: "1 person studied maths yesterday."
Gray: "2 people studied maths yesterday."
Blue: "3 people studied maths yesterday."
Black: "4 people studied maths yesterday."

Mr. Robin knows that only those who studied would be telling the truth and those who didn't would be lying. Who is telling the truth?

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