I'm reading a French article to practice my reading skills and I've come across this sentence:
Les scientifiques ont constaté qu'une personne seule a un risque accru de 29% de souffrir d'une crise cardiaque ou d'une angine de poitrine et 32% plus de risque d'être victime d'un AVC
I understand it pretty clearly, however, what is the point of "de" in "de souffrir..." and "d'être victime..."?
I understand that some verbs have de go after the infinitive, like for example permettre de, however I haven't heard of de going before the infinitive verb or anything like that.
Could someone explain to me why this is? Is there a rule for this use of de or something?