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U2 = 6
U7 = 31
a =1
b = 5
DIT = U40 ??
penye :
U40 = 1 + (40-1) 5
U40 = 1 + (39 × 5)
U40 = 1 + 195
U40 = 196
U7=31
maka cari beda dulu = 31-6 = 25 = 5
7-2 5
cari awal=
U2=a+(2-1)b
6=a+b
6=a+5
a=6-5=1
maka a=1, b=5
maka U40
Un =a+(n-1)b
U40=1+(40-1)5
U40=1+39.5
U40=1+195
U40=196