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a=suku pertama=204
b=beda setiap suku=4
Sn=n/2(2a+(n-1)b)
S₄₉=49/2(2(204)+(49-1)4)
S₄₉=49/2(408+(48)4)
S₄₉=49/2(408+192)
S₄₉=49/2(600)=14700(YANG D)
b = 4 (karena kelipatan 4)
a= 204
un = 396
n = (396 -204)/(4) + 1
n = 49
Sn = n/2 (a+un)
s49= 49/2 ( 204 + 396)
S49 = 49/2 (600) = 14.700