00:02
Okay, for this question, i'm given four -thirds over five -thirds plus four -thirds, four -thirds, i'm sorry, four to the third over five to the third, four to the fourth over five to the fourth, four to the fifth over five -to -the -fif, dot, dot, dot.
00:21
This is my first term, my second term, and my third term.
00:25
My nth term looks like 4 to the n minus 2 divided by 5 to the n minus 2.
00:38
Or i could say it's 4 5ths to the n minus 2.
00:44
So i'm looking at the sum of 4 5ths to the n minus 2.
00:52
I'm sorry, n plus 2, n plus 2.
00:58
When n equals 3, the exponent is 2.
01:03
Plus three, which is five, and so on.
01:06
So i need to first decide if this is a geometric series, and it is a geometric series if i'm multiplying by the same thing every time.
01:24
Anytime i have a number raised to the end, a constant number raised to the nth power, then that constant number inside is going to be your common ratio.
01:35
I can also find it by finding a thing...