1 , 3 , 5 , 7 , ... , ... , ... U6 = S6 =

Materi : Barisan dan Deret
Kelas : IX SMP

1 , 3 , 5 , 7 , ... , ...

U1 = 1
b = 2

Un = U1 + (n - 1) b
U6 = 1 + (6 - 1) 2
U6 = 1 + 5 . 2
U6 = 1 + 10
U6 = 11

Sn = n/2 ( 2.U1 + (n - 1) b)
S6 = 6/2 ( 2.1 + (6 - 1) 2)
S6 = 3 ( 2 + 5 . 2)
S6 = 3 ( 2 + 10)
S6 = 3 ( 12 )
S6 = 36

b = 3-1 + 2


U6
= a + 5b
= 1 + 5*2
= 1+ 10
= 11

S6
= 6/2 ( a + U6)
= 3 ( 1+ 11)
= 3(12)
= 36