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jawabannya 48,
caranya U5 = a + 4b = 30
U9= a + 8b = 42
kalau dikurang kan 4b = 12
jdi b = 3
a+4b = 30
a+4.3 = 30
a = 30-12 = 18
un = a + (n-1)b
u11= 18 + 10.3
=48
b) 3^n
5. diket : U5= 30= a + 4b
U9=42= a + 8b _
-12= -4b
b= 3
a + 4b = 30
a + 4(3) = 30
a = 18
jadi U11 = a + 10b
= 18 + 10(3)
= 48