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AMC 10 2022b Problem 18

  • Paper

Consider systems of three linear equations with unknowns xx, yy, and zz, \begin{align*} a_1 x + b_1 y + c_1 z & = 0 \ a_2 x + b_2 y + c_2 z & = 0 \ a_3 x + b_3 y + c_3 z & = 0 \end{align*} where each of the coefficients is either 00 or 11 and the system has a solution other than x=y=z=0x=y=z=0. For example, one such system is {1x+1y+0z=0,0x+1y+1z=0,0x+0y+0z=0}\{ 1x + 1y + 0z = 0, 0x + 1y + 1z = 0, 0x + 0y + 0z = 0 \} with a nonzero solution of {x,y,z}={1,−1,1}\{x,y,z\} = \{1, -1, 1\}. How many such systems of equations are there? (The equations in a system need not be distinct, and two systems containing the same equations in a different order are considered different.) (A) 302(B) 338(C) 340(D) 343(E) 344\textbf{(A)}\ 302 \textbf{(B)}\ 338 \textbf{(C)}\ 340 \textbf{(D)}\ 343 \textbf{(E)}\ 344

Dataset text NuminaMath-1.5. Quoted with source.

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338

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