to get there you need at least three level 8's. To get one level 8, you need at least 3 level 7's. And so on and so forth until you are at level 1. The trick though is that if I have 5 of a certain level, I can make 2 of the next. If I have 8, I can make 3. How many level 1's would i need to make a level 9, using the fewest possible level 1's?
istical learning". The link to the book is :
And the question is on page 413.
I found a solution online but couldn't really understand that: