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Un = 174
b = 6
Un = a + (n-1)b
174 = 24 + (n-1)6
150 = 6n -6
156 = 6n
n = 26
Sn = n/2 (a + Un)
S26 = 26/2 (24 + 174)
S26 = 13 (198)
S26 = 2574