| http://www.w3.org/ns/prov#value | - 05 Jul 2010, 18:10 i agree with both of you! however, when i use the method of picking numbers, i am afraid that it is not comprehensive enough for the question, meaning maybe it happens to be the case that i pick the right numbers and other numbers may not be right ( since we can not test every number in the math system) gmatclubot
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