If the sum of the second , 3rd, 4th terms of a positive term GP is 3 & the sum of 6th , 7th & 8th terms is 243 then the sum of first 50 terms of GP is 
Option: 1 \frac{1}{13}\left ( 3^{50}-1 \right )
Option: 2 \frac{1}{26}\left ( 3^{50}-1 \right )
Option: 3 \frac{1}{26}\left ( 3^{49}-1 \right )
Option: 4 \frac{2}{13}\left ( 3^{50}-1 \right )

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