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Verified answer
Barisan Aritmatika•
b = (U10 - U4)/(10 - 4) = (-13 - 17)/6 = -5
•
U4 = 17
a + 3b = 17
a + 3(-5) = 17
a = 17 + 15
a = 32
•
Un = a + (n - 1)b
Un = 32 - 5n + 5
Un = 37 - 5n
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