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a = 3
b = 2
pertama, harus mencari "n"
Un=41
41=a + (n-1)b
41=3 + (n-1)2
41=3 +2n-2
41=1 + 2n
41-1 = 2n
40=2n
20=n
jumlah suku pertama
Sn =
=
=10(44)
= 440
jadi, jawabannya D
:D :D :D :) :) :)