Sum of n terms of series \[12+16+24+40+.....\] will be [UPSEAT 1999]

1.	Sum of n terms of series \[12+16+24+40+.....\] will be [UPSEAT 1999]
A.	\[2\,({{2}^{n}}-1)+8n\]
B.	\[2({{2}^{n}}-1)+6n\]
C.	\[3({{2}^{n}}-1)+8n\]
D.	\[4({{2}^{n}}-1)+8n\]
Answer» E.

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Sum of n terms of series \[12+16+24+40+.....\] will be [UPSEAT 1999]

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