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4 - 0 = 4
U1+U2+U3(10)+U4+U5 = 10
Karena berurutan maka beda(b) = 1
Un = a + (n-1)b
10 = a + (3-1)1
10 = a + 2
a = 10-2
a = 8
U5 = 8 + (5-1)1
U5 = 8 + 4
U5 = 12
Jumlah bilangan terkecil dan terbesar = 8 + 12 = 20