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b = U2 - U1 = -7
U30 = a + (n-1)b
U30 = 37 + 29*(-7)
U30 = 37 - 203
U30 = -166
Ada yg salah silakan dikomentar:) trims
a= 37
b= U2-U1 = 30-37 = -7
U30 = 37 + (30-1) -7
37+(29 . -7)
37 + -203
U30 =-166