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:
. . . . .21,−41,81,−161,321,...
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.
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