00:01
So the key to these types of problems is that you are plugging in for n the number terms.
00:11
So just so you're aware, a sub 1 would be your first term.
00:16
That's what that 1 stands for.
00:18
So as you're looking at that, well, it's a negative of 1 over 1 squared.
00:24
Well, 1 squared is just 1, 1 divided by 1 is 1, you just have a negative in front.
00:29
So then you do that again for a sub 2.
00:32
That would be your second term.
00:36
And there's definitely a pattern.
00:37
It just might take you a while to realize it.
00:39
But when you plug in 2 and you square it, you get 4.
00:44
And you just leave it as 1 over 4.
00:47
So maybe i'll do one more and then just sort of get you to the pattern.
00:51
So a .3, that's your third term, is that you get negative 1 over 3 squared...