Jika diketahui suatu barisan aritmatika:
3,7,11,15. Tentukan Rumus suku ke-n nya!
3,7,11,15. Tentukan Rumus suku ke-n nya!
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U1 (a) = 3
beda (b) = U2 - U1
= 7 - 3
= 4
Rumus suku ke-n:
Un = a + (n - 1)b
= 3 + (n - 1)4
= 3 + 4n - 4
= 4n - 1
semoga membantu