n = 30
A1 = 200
S 30 = 5130
d?
A30?
S30 = [(A1 + A30) / 2 ] 30
5130 = [200 + A30)] / 2 ^30; 10260 = 6000 + 30 A30; 4260 = 30 A30; A30 = 142
A30 = A1 + (30 - 1) d; 142 = 200 + 29d; -58 = 29 d; d = -2
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n = 30
A1 = 200
S 30 = 5130
d?
A30?
S30 = [(A1 + A30) / 2 ] 30
5130 = [200 + A30)] / 2 ^30; 10260 = 6000 + 30 A30; 4260 = 30 A30; A30 = 142
A30 = A1 + (30 - 1) d; 142 = 200 + 29d; -58 = 29 d; d = -2