1.

Consider the general discretized equation given by aP P+ F~NB(P)aF F =0. Which of these statements is correct according to the opposite signs rule?

A. a<sub>P</sub> and a<sub>F</sub> are of opposite signs
B. a<sub>P</sub> and <sub>P</sub> are of opposite signs
C. a<sub>F</sub> and <sub>F</sub> are of opposite signs
D. <sub>P</sub> and <sub>F</sub> are of opposite signs
Answer» B. a<sub>P</sub> and <sub>P</sub> are of opposite signs


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