[Potironette]

Thank-you very much for the n(n+1) thing! I had a math test today where I had to use (n-1)² + (n-1) (or I guess that's just n(n-1)?) to find some sequence. That is how to start from 0 right?

The period before the test I learned from someone in physics class that a_i = a₁r^{something to do with n} and I guess that works because when things are in ratios, it means that every next number is just that ratio multiplied again (hence the power)? And I'm not sure exactly why it's multiplied by the a₁ except that if the power were n-1 then it could be the first number..?

I'm not sure how I could've passed the math test without the knowledge of these things which I haven't learned in class though o_o'