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Verified answer
Barisan AritmatikaUn = a + (n - 1)b
U2 + U15 + U40 = 165
(a + b) + (a + 14b) + (a + 39b) = 165
3a + 54b = 165
kedua ruas, bagi 3
a + 18b = 55
U19 = a + 18b = 55 ✔