1. The problem statement, all variables and given/known data If in an equation |x|+|y|+|z|=10, x,y,z ##\in## I, then the number of solutions are A)528 B)402 C)666 D)None 2. Relevant equations 3. The attempt at a solution I am clueless on this one. It looks to me that it represents 8 planes but I don't think that's going to help me here.