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Q)

Sum of n terms of series $\;1.3.5+3.5.7+5.7.9+$.......is

$(a)\;n\;(2n^3+8n^2+7n-2)\qquad(b)\;n\;(8n^3+11n^2-n-3)\qquad(c)\;8n^3+12^2-2n-3\qquad(d)\;None\;of\;the\;above$

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