4,8,14,22.......un...... u20
Matematika
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Pertanyaan
4,8,14,22.......un...... u20
1 Jawaban
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1. Jawaban Anonyme
Barisan Aritmatika Bertingkat
a......4......8.......14.......22......
b...........4......6.........8.......
c................2........2........
2A = c
2A = 2
A = 1
3A + B = b
3.1 + B = 4
B = 1
A + B + C = a
1 + 1 + C = 4
C = 2
Un = An² + Bn + C
Un = n² + n + 2
U20 = 20² + 20 + 2
U20 = 422