00:01
Suppose we have a sequence where the initial term, a1, is 6, and the common ratio r is negative 2.
00:06
Let's determine the nth term.
00:08
In order to do this, we need to turn to a formula from the book.
00:12
That is, the formula states, a .n, the nth term, is equal to a1, the first term, times the common ratio r to the n -minus 1 power.
00:21
Let's use this to find the fifth term first.
00:24
So for the fifth term, we would have that n equals 5.
00:27
A5 is equal to a1, which is 6.
00:30
Times r, which is negative 2, to the n minus 1, that is 5 minus 1...