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m22 #21

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m22 #21 [#permalink] New post 09 May 2010, 12:44
What is 10-8+6-4+...+(-20)?
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Re: m22 #21 [#permalink] New post 11 May 2010, 23:06
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] New post 18 Jul 2010, 09:33
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, 09:33
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m22 #21

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