a = -2
b = 1 - (-2) = 1 + 2 = 3, 4 - 1 = 3, 3 konstan.
Sn = n/2(2a + (n - 1)b)
S100 = 100/2(2(-2) + (100 - 1)3)
S100 = 50(-4 + 297)
S100 = 50(293)
S100 = 14650.
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Verified answer
a = -2
b = 1 - (-2) = 1 + 2 = 3, 4 - 1 = 3, 3 konstan.
Sn = n/2(2a + (n - 1)b)
S100 = 100/2(2(-2) + (100 - 1)3)
S100 = 50(-4 + 297)
S100 = 50(293)
S100 = 14650.