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dik:
U1/a = 5
Ut = 23
U8 - U3 = 10
a+7b-(a-2b) = 10
5b = 10
b = 2
Ut= a+(n-1)b
Ut = a+ bn-b
23 = 5 + 2n - 2
20 = 2n
n = 10
berarti banyak sukunya adl 10
b. Ut+ U1 = 2 Utengah
23 + 5 = 2 Utengah
28 = 2 Utengah
Utengah = 14