log 11 + log 121 + log 1331 + --------- ধারাটির প্রথম দশটি পদের সমষ্টি কত ?
Correct Answer: Option B
Log 11+ log 121 + log 1331 + -------
= log 11 + log 112 + log 113 + -------- log 1110
= log 11 +2 log 11 + 3 log 11 + -------- 10 log 11
= log 11(1+2+3+----- 10)
= \(\frac{{10(10 + 1)}}{2}\log 11\) = 55 log 11
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