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bil 2 = n + 1 (21)
bil 3 = n + 2 (22)
n + n + 1 + n + 2 = 63
3n + 3 = 63
3n = 63 - 3
n = 60 : 3
n = 20
20 + 22 = 42
B
jadi jumlah bilangan terkecil dan terbesar = 42