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Re: If n and p are integers, is p > 0? [#permalink]

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28 Aug 2014, 06:15

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Re: If n and p are integers, is p > 0? [#permalink]

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18 May 2016, 06:44

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Re: If n and p are integers, is p > 0? [#permalink]

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18 May 2016, 16:28

Expert's post

This is a question that appears in PREP. There are 2 variables (n and p). In order to match the number of variables to the number of equations, we need 2 equations. Since the condition 1) and the condition 2) each has 1 equation, there is high chance that C is the correct answer. Using both the condition 1) and the condition 2), we get n=1,2,3....>0. Then, p also becomes positive. The answer is yes and the condition is sufficient. Thus, the correct answer is C.

- For cases where we need 2 more equations, such as original conditions with “2 variables”, or “3 variables and 1 equation”, or “4 variables and 2 equations”, we have 1 equation each in both 1) and 2). Therefore, there is 70% chance that C is the answer, while E has 25% chance. These two are the majority. In case of common mistake type 3,4, the answer may be from A, B or D but there is only 5% chance. Since C is most likely to be the answer using 1) and 2) separately according to DS definition (It saves us time). Obviously there may be cases where the answer is A, B, D or E. _________________

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