The last day of century can be which of the following day?

100 years contain 5 odd days.
∴ Last day of 1^st century is Friday.
200 years contain (5 x 2) = 3 odd days.
∴ Last day of 2^nd century is Wednesday.
300 years contain ( 5 x 3) = 15 = 1 odd day.
∴ Last day of 3^rd century is Monday
400 years contain 0 odd day.
∴ Last day of 4^rd century is Sunday.
This cycle is repeated that means last day of century is Friday, Wednesday, Monday, or Sunday and it repeats the cycle.