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چرا اینقدر به خودتون فشار میارید. مگه دو طرف یه رشته ی دنا( نه هر دو رشته) با هم فرق نداره. خب (ب) همونه و جواب گزینه 3.
https://www.kanoon.ir/Download/AzmoonFile/392f5130-afa6-4324-b09a-0829cc85a2c6 H_R اینه لینک آزمون