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b = 2
S15 = 15/2 ( 2 x 23 + (15-1)2)
S15 = 7,5 (46 + ( 14 x 2)
S15 = 7,5 (46 + 28)
S15 = 7,5 (74)
S15 = 555
maka ada 555 kursi