Arithmetic Series

Determine the value of
-1 + 2 – 3 + 4 – 5 + 6 – 7 + 8 – 9 + 10 – 11 + 12 – 13 + 14 – 15 + 16 – 17 + 18

Answer ?
-1 + 2 – 3 + 4 – 5 + 6 – 7 + 8 – 9 + 10 – 11 + 12 – 13 + 14 – 15 + 16 -17 + 18
= (2 – 1) + (4 – 3) + (6 ???? 5) + (8 – 7) + (10 – 9) + (12 – 11) + (14 – 13) + (16 – 15) + (18 – 17)
= 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1
= 9

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