ALternating series

[maria peppers]

I forgot how to figure out alternating number series
example: 36 42 35 28 45 21 14 7 ? ?

 

[Denis]

I forgot how to figure out alternating number series
example: 36 42 35 28 45 21 14 7 ? ?

So did I.

 

[stapel]

I forgot how to figure out alternating number series

The customary definition of an "alternating" sequence (a "series" is when you add the numbers) is a sequence in which the signs alternate, such as:

. . . . .\(\displaystyle \large{\frac{1}{2}\, ,\,-\frac{1}{4}\, ,\,\frac{1}{8}\, ,\,-\frac{1}{16}\, ,\,\frac{1}{32}\, ,\, ...}\)

But there are no sign changes in your sequence, so your book must be using some non-standard definition.

Please reply with the necessary information, including the instructions for this exercise. When you reply, please show what you have attempted. Thank you.

Eliz.