Help please, Arithmetic sequenceeee?
If sum of the first two terms of an arithmetic sequence equals the sum of the first three terms, show that the sum of the first five terms is zero
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from the above information you can clearly make out that the third term is zero
so for any value of common difference 'd'
the terms will be
0-2d, 0-d , 0 , 0+d, 0+2d
when you sum em up they will become zero.