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Maka
a= 45 (suku pertama)
b = 50-45 = 5 (beda)
n = 50 (suku yg ditanyakan)
Un = a + (n-1)b
U50 = 45+ ( 50-1)5
U50 = 45 + 49 . 5
U50 = 45 + 245
U50 = 290
U₅₀ = 5.50+40
= 250+40
= 290