kak tolong Bantu jawab Un Dan N nya 2 + 4 + 6 + 8 +... +Un =1.829

u1=2 u3=6
u2=4 u4=8 b= 4-2=2
dit : n..?
jwb : un = a + (n-1)b
1829 = 2 + (n-1) 2
1829 = 2 + n2-2
1829 = 2-2 + n2
1829 = n2
n2 = 1829
n = 1829:2
n = 914. 5

maaf kalo salah