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Un = 294
294 = a + (n-1)b
294 = 102 + (n-1)6
294 = 102 + 6n - 6
294 = 96 + 6n
6n = 294-96
n = 198/6 = 33
Sn = n/2 (u1 + un)
S33 = 33/2 (102+294)
S33 = 33/2 . 396
S33 = 33 . 198
S33 = 6534