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-36 = 15 + (n - 1) x -3
-36 = 15 + -3n + 3
-36 = 18 - 3n
-54 = -3n
18 = n
Sn = n/2 x (a + Un)
S18 = 18/2 x (15 + -36)
S18 = 9 x -21
S18 = -189
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