Flawed indeed, the correct answer is 0.000001729%.you mean day+month+year = 68 has occurred 534 times since 1900? if so:
121 years x 365 days = 44165, which means 68 is the result 0.012% of times. So for the result to be 68 for 3 specific and related events, wouldn't that be 0.012 * 0.012 * 0.012 = 0.000001728% chance of it happening?
I accept my probabilities math understanding may be flawed as its 40 years+ since I last used it.....