log2+log4+log8+......ধারাটির প্রথম দশটি পদের সমষ্টি কত?
Solution
Correct Answer: Option B
এখানে,
প্রদত্ত ধারাটি, log2 + log4 + log8 + -----
= log2 + log4 + log8 + -----
= log21 + log22 + log23 + -----
= log2 + 2log2 + 3log2 + -----
= log2 (1 + 2 + 3 + ---------)
= log2 {10(10 + 1)/2}
= log2 (5 × 11)
= log2 × 55
= 55log2
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