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Sn = a ( 1 - r^n ) / 1 - r
S4 = 6 ( 1 - (1/3^4 ) / 1 - 1/3
S4 = 6 ( 1 - ( 1/ 81 ) / 2/3
S4 = 6 ( 80/ 81 ) / 2/3
S4 = ( 480 / 81 ) / ( 2/3)
S4 = 80 / 9
smoga mmbantu yah☺