If P =(a1 , a1) Q (a1 , b1)then (PQ) is:

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If P =(a1 , b1) Q (a2 , b2)then (PQ) is:

(a1+b1)i+(a1+b1)j

(a1+a2)i+(b2+b1)j

(a2+a1)i+(b2-b1)j

(a2-a1)i+(b2-b1)j