1, 3, 6, 10, 15, 21, 28 cari pola ke 50!
Matematika
nisa1657
Pertanyaan
1, 3, 6, 10, 15, 21, 28 cari pola ke 50!
2 Jawaban
-
1. Jawaban Dimezs
Un = n/2 (n+1)
U50 = 50/2 (50 + 1)
= 25 (51)
= 1275 -
2. Jawaban Anonyme
1,3,6,10,...
a = 1
b = 3-1 = 2
c = 1
Un = a + b(n - 1)/1! + c(n - 1)(n - 2)/2!
Un = 1 + 2(n - 1) + (n - 1)(n - 2)/2
Un = (1/2)n² + (1/2)n
Un = (1/2)(n² + n)
U50 = (1/2)(50² + 50) = 1275