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Verified answer
S∞ = 9/2a/(1 - r) = 9/2
a/(1 - 1/3) = 9/2
a/(3/3 - 1/3) = 9/2
a/(2/3) = 9/2
a = 9/2 × 2/3
a = 3
U1 = a = 3