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a=102
b = 6
= 294
= a + (n-1)b
294 = 102 + (n-1)6
294 = 102 + 6n - 6
294 = 96 + 6n
294-96 = 6n
198 = 6n
n = 33
= x ( a + )
= x ( 102 + 294)
= x 396
= 6534