I mean having rich parents itself is already luck.

I kinda want to say success equals hard work times luck. Some people’s luck is 0. No matter how hard they work, they’ll never be successful. Other people are born to rich parents and have luck in many other ways too. These people will easily achieve success through hard work.

Only problem is, it’s possible to achieve success with luck alone and no hard work - just be born to billionaire parents and you’ll NEVER have to work a day in your life.

So maybe it’s even worse than that: success = hard_work * luck + luck