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7. Ifp =i-2j +k, q = 2i-j +k, and r =j-2k, determine each of the following:[T/I=6] b) (p-q) (p+q) c) (p * r) * r

7. Ifp =i-2j +k, q = 2i-j +k, and r =j-2k, determine each of the following:[T/I=6]

b) (p-q) (p+q) c) (p * r) * r d) (P * q ) * r

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