Roberval and Mersenne found that Fermat's problems in this first, and subsequent, letters were extremely difficult and usually not soluble using current techniques.
Roberval at Mersenne natagpuan na Fermat ng problema sa unang na ito, at kasunod na, letra ay lubhang mahirap at karaniwan ay hindi malulutas gamit ang mga kasalukuyang pamamaraan.