Apologies, not all of us are able to see straight through to the truth in every case. This argument convinced me (not least because it occurred to me too a few

Apologies, not all of us are able to see straight through to the truth in every case. This argument convinced me (not least because it occurred to me too a few years ago ;) - I hadn't seen it anywhere before at the time, though I'm sure this is because (a) I hadn't spent much time looking, and (b) to those skilled in the art, it is so obvious as to be barely worthy of comment. If you're simply not convinced by his line of thought (it's hard to tell...), an alternative argument might be: noting that 3 multiplied by one third is 1, consider what that would look like if written out in decimal notation. (I am sure there are plenty more arguments too, probably much better than mine.)