I wonder who got the first correct answer of 6 and 72 within 15 minutes of the question being asked. Probably a lucky guess .
Go on. You have the last word, divebuddy unless you want to let it lie. I'm off to bed to count sheep (although I may need to take al ist of numbers with me to help me)
Still, Prudie, if you'd read rr's post in reply you'd have noticed that the only person who was actually required to understand the explanation actually did. So I'm going call my explanation a success, and nerts to your opinion.