4017+4013...........+9+5+1= sn?
![]()
Jawab:
2019045
Penjelasan dengan langkah-langkah:
a = 4017
Un = a + (n - 1)b
1 = 4017 + (n - 1) (-4)
1 = 4017 -4n + 4
1 = 4021 - 4n
4n = 4020
n = 1005
S1005 = [tex]\frac{n}{2}[/tex] (a + U1005)
S1005 = [tex]\frac{1005}{2}[/tex] (4017 + 1)
S1005 = [tex]\frac{1005}{2}[/tex] (4018)
S1005 = 1005 (2009)
S1005 = 2019045
