Question: Given the points P : (1, 1, -1), Q : (1, 2,0), R : (-2, 2, 2), find (a) PQ x PR. (b) a plane

Given the points P : (1, 1, -1), Q : (1, 2,0), R : (-2, 2, 2), find (a) PQ x PR. (b) a plane ax + by + cz = d through P. Q, R
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