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a = 3
b = 3
Un = 96
Un = a + (n - 1)b
96 = 3 + (n - 1)3
96 = 3 + 3n - 3
96 = 3n
32 = n
Sn = n/2(2a + (n-1)b)
S32 = 32/2(2.3 + (32-1)3)
S32 = 16(6 + 93)
S32 = 16(99)
S32 = 1584