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