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JEEMAIN and NEET
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Mathematics
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Class11
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Sequence and Series
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Sum of series $(n)(n)$ + $(n-1)(n+1)$ + $(n-2)(n+2)$ +....+ $1\;(2n-1)$ is
$(a)\;n^3\qquad(b)\;\frac{1}{6}\;n\;(n+1)\;(n+2)\qquad(c)\;\frac{1}{3}n^3-n^2\qquad(d)\;None$
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