<p><img src="http://www.sothik.com/files/model-test/du-20216/image039.png" alt="" />এর বিস্তৃতিতে x<sup>7</sup> এর সহগ</p>
Answer: B - <p><img src="http://www.sothik.com/files/model-test/du-20216/image040.png" alt="" /></p>
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