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4. If the segment joining the points (a, b), (c, d) subtends a right angle at the origin, then? a) ac-bd=0 b) ac+bd=0 c) ab+cd=0 d) ab-cd=0

Answer» 4. If the segment joining the points (a, b), (c, d) subtends a right angle at the origin, then? a) ac-bd=0 b) ac+bd=0 c) ab+cd=0 d) ab-cd=0


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