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U3 = 11
U8 = 26
ditanya :
U30
Jawaban :
Un = a + (n-1)b
U8 = a + 7b
26 = a +7b
a = 26-7b
Un = a + (n-1)b
U3 = a + 2b
11 = a + 2b
a= 11-2b
a=a
26-7b = 11-2b
- 5b = - 15
b = 3
a+2b = 11
a+6 = 11
a = 5
u30 = a + 29b
u30 = 5 + 29(3)
u30 = 92