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maaf kalau salah
a = 3
b = 2
Un = a+(n-1)b
49 = 3+(n-1)2
49 = 3+2n-2
49 = 1+2n
2n = 48
n = 24
Sn = n/2 (a+Un)
S24 = 24/2 (3+49)
= 12 x 52
= 624
semoga membantu :)