Soal aritmatika bantu yaa

9. Rumus Un untuk barisan aritmetika: Un = a + (n-1) b
U1= n= 23
U12 = a + 11b
122 = 23 + 11b
11b = 99
b = 9

10.
U4 = a + 3b = 15
U2 = a + b   = 7
Eliminasi = 2b = 8
b = 4

a + b = 7
a + 4 = 7
a = 3

U10 = a + 9b
= 3 + 9(4)
= 3 + 36
∴ 39

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