SOLUTION: express 3-6+12-24+ using sigma notation

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Question 1081531: express 3-6+12-24+ using sigma notation
Answer by math_helper(2461) About Me  (Show Source):
You can put this solution on YOUR website!
++sum%28%28%28-1%29%5E%28n-1%29%2A3%282%5E%28n-1%29%29%29%2C+n=1%2Cinfinity%29+
which may be written:
++sum%28%28%28-2%29%5E%28n-1%29%2A3%29%2C+n=1%2Cinfinity%29+