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=2n (a)
= 2³ = 8
x , (x + 2) , (x + 4) , (x + 6)
Maka,
x + (x + 2) + (x + 4) + (x + 6) = 80
4x + 12 = 80
4x = 80 - 12
4x = 68
x = 68/4
x = 17
Bilangan terkecil,
x = 17
Bilangan terbesar,
(x + 6)
= 17 + 6
= 23
Sehingga, jumlah bilangan terbesar dan terkecil adalah 23 + 17 = 40