jumlah tak hingga dari deret geometri 3 + 1 + 1/3 + 1/9 + ....... adalah....

- Barisan dan Deret -

a = 3
r = 1/3

S~ = a / (1-r)
S~ = 3 / (1-1/3)
S~ = 3 / (2/3)
S~ = 3x 3/2
S~ = 9/2
S~ = 4 1/2

semoga membantu
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-vin