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r = u2/u1
r = -9/27 = -1/3
S6 = a(1- r^5)/1-r
S6 = 27(1-(-1/3)^5 / 1-(-1/3)
S6 = 27(1+1/243) / 4/3
S6 = 27(244/243) / 4/3
S6 = 244/9 * 3/4
S6 = 61/3
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