Jawabanmu

2014-02-05T18:34:55+07:00
102.105.108, ............., 198
a=102
b=3

Un = a+(n-1)b
198 = 102 + 3b-3
198 = 99 + 3b
198 - 99 = 3b
99 = 3b
b=33

Sn = n/2 (a+Un)
S33 = 33/2 (102+198)
       = 16.5(300) = 4950
 
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