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u1 = a = 204
b = 4
Un = 396
jawabnnya
Un =a + (n-1)b
396= 204 + (n-1)4
396 = 204 + 4n – 4
396 = 200 + 4n
396-200= 4n
196 = 4n
196/4 = n
49 = n
Sn = n/2 (2a + (n-1)b )
S49 = 49/2 (2 x 204 + ( 49-1)4)
= 49/2 ( 408 + 192 )
= 49/2 x 600
= 49 x 300
= 14700
jawabnnya 14700