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List of EQUATIONS?

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |
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by gmatjedi » Sun May 16, 2010 9:32 am
I'll add a formula that I came across recently:

Area of the triangle when coordinates of the vertices are (x1, y1), (x2, y2), (x3, y3)
= {|x1 (y2 - y3) + x2 (y3 - y1) + x3 (y1 - y2)|}/ 2
(taken from Rahul's post)

I hope each of us can share important formulas and/or processes that would enable solving the more difficult quant questions.

It could serve as a great resource for the community.

PLEASE ADD.

Thanks,
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Senior | Next Rank: 100 Posts
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by gmatjedi » Sun May 16, 2010 2:52 pm
Generally, the smallest prime factor of h(n)+1 is larger than n/2.
from cneal4

is anyone interested in contributing?
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