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keluarkan 1/3, sehingga :
P = 1/3 x (1 + 1/3 + 1/9 + 1/27 +....)
P = 1/3 x (1 + P)
3/1 P = 1 + P
3P = 1 + P
3P-P = 1
2P = 1
P = 1/2