Question:`log2+log16+log512+...........` একটি ধারা । ধারাটির 12 পদের সমষ্টি কত ? 

A `3900log2` 
B `65log2` 
C `650log2` 
D `39log2` 

+ Answer
C 

+ Explanation
`(1^2+2^2+3^2+............+12^2)`log2
`={1/6 12(12+1)(2 xx 12+1)}log2 = 650log2`

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sahana pervin

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