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Question
1 + ½ + ¼ + ⅛ + ... ধারাটির প্রথম সাতটি পদের যোগফল কত?
33/31
63/32
63/64
127/64
ANSWER : 4
Descrption
<p>সমাধানঃ এটি গুনোত্তর ধারা। এখানে ১ম পদ , a = 1 সাধারন অনুপাত, r = 1/2/1 = 1/2 পদ সংখ্যা, n = 7 = ৭ </p> <p> ৭ টি পদের সমষটি = a(1 - r<sup>n)</sup>\1 - r = 1(1 - (1/2)<sup>7</sup>/ 1 - (1/2) = 127/64</p>
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