a = -2
b = 1 - (-2) = 1 + 2 = 3, 4 - 1 = 3, 3 konstan.
Un = a + (n - 1)b
U25 = -2 + (25 - 1)3
U25 = -2 + (24)(3)
U25 = -2 + 72
U25 = 70.
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Verified answer
a = -2
b = 1 - (-2) = 1 + 2 = 3, 4 - 1 = 3, 3 konstan.
Un = a + (n - 1)b
U25 = -2 + (25 - 1)3
U25 = -2 + (24)(3)
U25 = -2 + 72
U25 = 70.