Suku ke14 barisan 15,24,35,48,63 adalah A 185 B 194 C288 D 312
Matematika
satrianaagresi
Pertanyaan
Suku ke14 barisan 15,24,35,48,63 adalah
A 185
B 194
C288
D 312
A 185
B 194
C288
D 312
1 Jawaban
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1. Jawaban ZhidanYanuarP
15, 24, 35, 48, 63 -> a + b + c
9 11 13 15 -> 3a + b
2 2 2 -> 2a
2a = 2
a = 1
3a + b = 9
3(1) + b = 9
b = 9 - 3
b = 6
a + b + c = 15
1 + 6 + c = 15
c = 15 - 7
c = 8
Un = an^2 + bn + c
U14 = 1(14^2) + 6(14) + 8
U14 = 196 + 84 + 8
U14 = 288
jawaban = c