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83 => a + 2b = 18 +
4b = 20
b = 5
subtitusikan
a + 2(5) = 18
a + 10 = 18
a = 18 - 10
a = 8
jumlah 24 suku
Sn = n/2 (2a + (n-1)b
S24 = 24/2 ( 2x8 + (24-1)5)
= 12 ( 16 + 115)
= 12 ( 131 )
= 1572
jawabnnya adalah 1572
S₂₄ = 24/2 (2.8 + (24-1) .5
S₂₄ = 24/2 (2.8 + 23 . 5)
S₂₄ = 24/2 (16 + 115)
S₂₄ = 24/2 .131
S₂₄ = 12 .131
S₂₄ = 1572
Maaf Kalau Salah^^