Any idea? Please help.

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |

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by shankar.ashwin » Wed Nov 02, 2011 10:41 pm
https://www.beatthegmat.com/tough-prime- ... 25475.html

One of the most discussed problems in this forum. Search for so many different explanations. Infact most question you posted have been discussed several times here. Search the forum for a lot of better/elaborate explanation by experts.