1,3,5,7... tentukan jumlah suku ke- 10

1, 3, 5, 7, 9, 11, 13, 15, 17, 19
suku ke 10 adl 19

Barisan Dan Deret
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Cara Mengerjakan :
1, 3 , 5 , 7

a = U1 = 1
U2 = 3

b = U2 - U1
b = 5 - 3
b = 2

Suku ke 10 (U10)
U10 = a + 9b
U10 = 1 + 9 (2)
U10 = 1 + 18
U10 = 19

Jumlah 10 suku
S10 = 1/2 (10) × (a + U10)
S10 = 10/2 × (1 + 19)
S10 = 5 × 20
S10 = 100

Semoga bisa bermanfaat
HAHO