You will only need 5 numbers. Repeating the same numbers over again will make for a simple 'Bingo' and make the game much easier to manage than I personally find...
Subscribers do not need to be Microsoft Outlook users. ListServ will work with any email client that is compatible with SMTP (all of them!). There is even an HTML interface...
First, find the solutions x for det(A - xI) = 0, where I is the identity matrix and x is a variable. The solutions x are your eigenvalues. Let's say...
You need to practice solving it, then get faster and faster at it. You'll be a good cuber in no time only if you practice often, there is no shortcut...