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m22 #21

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m22 #21 [#permalink]

09 May 2010, 13:44

What is 10-8+6-4+...+(-20)?

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Re: m22 #21 [#permalink]

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]

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

		Similar topics	Author	Replies	Last post
Similar Topics:	5	M22 #10	snowy2009	16	02 Oct 2008, 12:20
	3	m22#3	ventivish	17	26 Nov 2008, 19:54
	41	M22#16	ventivish	20	26 Nov 2008, 20:17
	15	m22#30	ventivish	31	26 Nov 2008, 21:27
	1	m22 #21	nonameee	2	04 Dec 2011, 06:45

m22 #21

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m22 #21

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