7,10,16,25,37 tentukan u17
Barisan Aritmatika Bertingkat
7, 10, 16, 25, 37, … a = 7
3, 6, 9, … b = 3
3, 3, 3, … c = 3
Rumus suku ke–n (Un)
Un = a + (n – 1)b + c/2 (n – 1)(n -2)
suku ke–17 (U17)
U17
= 7 + (17 – 1).3 + 3/2 (17 – 1)(17 – 2)
= 7 + (16 × 3) + 3/2 × 16 × 15
= 7 + 48 + 360
= 415
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