Ben and Mark are students of Mr Tan. Mr Tan's birthday is on and both of them know that Mr Tan's birthday is one of these dates:
Mr Tan tells Ben the value of and tells Marc the value of .
Then Mr Tan asks them: "Do you know when is my birthday?"
Ben says: "I don't know, but I can ensure that Mark doesn't know too."
Mark says: "Initially I don't know, but I know it now."
Ben says: "Oh! Then I know it too."
Base on the dialogue and the dates given, can you figure out which date is Mr Tan's Birthday?
Give your answer as
Assume Mark and Ben are amazing at their logic
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