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# m22 #21

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Director
Joined: 03 Sep 2006
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m22 #21 [#permalink]

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09 May 2010, 13:44
What is 10-8+6-4+...+(-20)?
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Re: m22 #21 [#permalink]

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12 May 2010, 00:06
I'm gonna go out on a limb and say 16. It appears that the difference each time is 2 and then those 2s are added together 8 times for a total of 16.
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Re: m22 #21 [#permalink]

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18 Jul 2010, 10:33
well I think the answer is 16.. here's how-

(10-8) + (6-4) + (2-0) + (-2-(-4)) + (-6-(-8)) + (-10-(-12)) + (-14-(-16)) + (-18-(-20))

= 16
Re: m22 #21   [#permalink] 18 Jul 2010, 10:33
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# m22 #21

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