Freeflows

Alternating Integer Sequence

The positive integers up to 2007 are alternately subtracted and added: \[1 - 2 + 3 - 4 + \cdots + 2001 - 2002 + 2003 - 2004 + 2005 - 2006 + 2007.\]What is the value of the expression?

1
2
3
+
4
5
6
-
7
8
9
$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$

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