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It should be some where like this : E:\Desktop\FTB\EthosLPPack\minecraft\mods, or just find wherever you installed you'r ftb folder then follow address through EthosLPPack and minecraft
For anyone experiencing this problem go Here http://www.curse.com/mc-mods/minecraft/229002-mrtjpcore/2231791 to get the correct version , then go to the launcher and hit edit mods and add mod then just select it that shouls work (it at least worked for me)
