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2. U1 = a = 3
U2 = a+b = 3+4 = 7
U3 = a+2b = 3+2.4 = 11
3. U3 = 10
a+2b = 10 .... (1)
U5 = 18
a+4b = 18 .... (2)
Eliminasi (1) dan (2)
a+2b=10
a+4b=18
________ -
-2b = -8
b = 4
a = 2 = U1
U9=a+8b = 2+8.4 = 34