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u3 ⇒ a + 2b = 18 _
4b = 20
b = 5
subtitusikan
a + 2b = 18
a + 2(5) = 18
a + 10 = 18
a = 18-10
a = 8
jumlah suku
S24 = n/2 ( 2a + (n-1)b )
= 24/2 ( 2 x 8 + ( 24-1) 5)
= 12 ( 16 + 115)
= 12 ( 131)
= 1572
jawabannya adalah 1572