Question:log 3+log 9+log 27+........ ধারটির  10 তম পদ কত ? 

A log 1000 
B log 9000 
C log 72900 
D log 59049 

+ Answer
D 

+ Explanation
`:.` 10 তম পদ =a+(10-1)d = log3+9 log3
              =10 log 3 = log `3^10` = log 59049

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sahana pervin

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