Question:স্বাভাবিক জোড় সংখ্যার বর্গের সমষ্টি নিচের কোনটি ? 

A `2/3 n(n+1)(2n+1)` 
B `1/6n(n+1)(2n+1)` 
C `n^2` 
D `2/3(n-1)n(2n-1)` 

+ Answer
A 

+ Explanation
`2^2+4^2+........+(2n)^2=2^2(1^2+2^2+........+n^2)`
`=4 1/6n(n+1)(2n+1)=2/3n(n+1)(2n+1)`

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sahana pervin

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