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b= (U10-U1)/(10-1)
b= (16-(-2))/9
b=18/9
b=2
Un= (n-1).b +a
U25=25-1 .2 + -2
U25= 24.2 + -2
U25= 48 -2
U25 = 46
U1 = -2
b = U10- U1 = 9
16 - (-2) = 18
9 : 18 = 2
Un = a +(n-1)b
= -2 +(25-1)2
= -2+ 24 * 2
= -2 + 48 = 46
(kalo ga salah yahhh )
a = awal
b = selisih
n = urutan yg ditanyakan