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21 : 3 x 12
7 x 12
84
U1 = a + (1-1) b = 3
a = 3
U 3 = a +( 3-1) b = 21
a + 2b = 21
jad
a + 2b = 21
a = 3
2b = 18
b = 9
nah
a = 3
b = 9
maka
U12 = 3 + ( 12- 1) 9
= 3 + 11.9
= 3 + 99
= 102
selesaii