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Let Sn=underset(k=1)overset(4n)Sigma (-1...

`Let S_n=underset(k=1)overset(4n)Sigma (-1)^((k(k+1))/2)k^2`.Then `S_n` can take value (s)

A

`40xx41`

B

`18xx19`

C

`20xx21`

D

`22xx23`

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