By the way, it's alleged by a famous professor(?) and amazon reviewer Michael Emmet Brady that Ramsey in no way "demolished" his theory and that this particular problem has drawn people away from respecting and appreciating Keynes immense work in philosophy of probability
here is the review: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2927587
"An Examination of the Fundamental Reasons Why Frank Ramsey Failed in His Reviews of J M Keynes's a Treatise on Probability"