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38 - 18 = 4b
b = 20/4 = 5
Un = a + (n-1)b
U3 = a + 2b
18 = a + 2(5)
a = 18 - 10 = 8
setelah a dan b ketemu, masukin ke rumus Sn berikut,
Sn = n/2 (2a + (n-1)b)
S24 = 24/2 (2*8 + 23*5) = 1572
ctt:
* = kali