tolong bantu yak. saya kurang ngerti soal kayak gini.

4 + 8/3 + 16/9 .........
r = 8/3 : 4 = 2/3
dit :
sn = 6
sn = a ( 1 _ r ^n ) /1 _ r
sn = 4( 729/729 _ 64/729 ) / 3/3 _ 2/3
= 4( 665/729)/1/3
=2660/729 : 1/3
= 2660/729 x 3 = 7980/729
sn = 10., 946502058

semoga dapat membantu