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306, 312, 318, 324, ..., 396
396 = 306 + ( n - 1 ) 6
396 = 306 + 6n - 6
396 = 300 + 6n
6n = 96
n = 16
S₁₇ = 16 : 2 ( 2 × 306 + ( 16 - 1 ) 6 )
= 8 ( 612 + 15 × 6 )
= 8 × 702
= 5.616