SOLUTION: nth element of sequences -1,2,-4,8 is

Algebra ->  Sequences-and-series -> SOLUTION: nth element of sequences -1,2,-4,8 is      Log On


   

Question 1000369: nth element of sequences -1,2,-4,8 is
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Same question asked about three times.

Let n be the index.
Sign is alternating as %28-1%29%5En.
Basic size of terms is according to 2%5E%28n-1%29.
Put them together.