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204, 210, .... , 294
a = 204
b = 6
Un = 294
Un = a + (n-1)b
294 = 204 + (n-1)6
294 = 204 + 6n - 6
6n = 294 - 204 + 6
6n = 96
n = 16
Sn = n/2 (a + Un)
S16 = 16/2 (204 + 294)
= 8 x 498
= 3984
semoga membantu ya :)