I am writing this immediately before setting off for Marxism 2018, a four-day political festival taking place in London. I should be able to do some posting at the event and at my accommodation. In my recent “An A-Z of Me” I included a mathematical problem from brilliant.org, and I now post the solution to that problem and offer you a couple of others.
The problem I posted earlier was this:
The answer is that there is not, because it turns out that the perimeter of a plus-plus is always a multiple of four, which 2018 is not.
TWO NEW PROBLEMS
These are also both from brilliant.org. One is easy but generated a bit of controversy, while the other is very hard to solve properly, but by applying logic it can be easily worked out what the correct answer is. First, the hard problem:
The easier problem which generated some controversy is this one: