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[" 1-2."ABCD" is a parallelogram whose d...

[" 1-2."ABCD" is a parallelogram whose diagonals meet at "P" .If "O" is a fixed point,then "],[vec OA+vec OB+vec OC+vec OD" equals: "],[[" (A) "vec OP," (B) "2vec OP," (C) "3vec OP," (D) "4bar(OP)],[" Sol."," since,P bisects both the diagonal AC and "BD_(2)" so "]]

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