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# m22 #21

Author Message
Director
Joined: 03 Sep 2006
Posts: 862

Kudos [?]: 1128 [0], given: 33

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09 May 2010, 12:44
What is 10-8+6-4+...+(-20)?

Kudos [?]: 1128 [0], given: 33

Manager
Joined: 08 May 2010
Posts: 140

Kudos [?]: 68 [0], given: 39

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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.

Kudos [?]: 68 [0], given: 39

Intern
Joined: 11 Mar 2010
Posts: 11

Kudos [?]: [0], given: 1

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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

Kudos [?]: [0], given: 1

Re: m22 #21   [#permalink] 18 Jul 2010, 09:33
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# m22 #21

Moderator: Bunuel

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