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Un = a+(n-1)b
a = suku pertama = 7
n = barisan yg diminta = 50
b = selisih suku 2 dan 1 atau suku 3 dan 2
dan seterusnya = 3
U50 = 7+(50-1)3
= 7+(49)3
= 7+147
= 154
tapi disitu gk ada jawabannya