S100 = 100, Sn= n/2 (a + Un) , maka S100 = 50 (a +U100) = 100. Sehingga a+U100 = 2. S99 = 99/2 (a+U100-b)=92. Sehingga 198-99b=184, b=14/99 .. U100+a = 2. 2a+99b=2 , 2a+14=2 , a=-6. U100= 2-a, maka U100=8
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S100 = 100, Sn= n/2 (a + Un) , maka S100 = 50 (a +U100) = 100. Sehingga a+U100 = 2. S99 = 99/2 (a+U100-b)=92. Sehingga 198-99b=184, b=14/99 .. U100+a = 2. 2a+99b=2 , 2a+14=2 , a=-6. U100= 2-a, maka U100=8