Jawaban:

BA = { (0,a), (0,b), (0,c), (1,a), (1,b), (1,c), (2,a), (2,b), (2,c), (3,a), (3,b), (3,c), (4,a), (4,b), (4,c), (5,a), (5,b), (5,c), (6,a), (6,b), (6,c), (7,a), (7,b), (7,c), (8,a), (8,b), (8,c), (9,a), (9,b), (9,c) }

Penjelasan:

A = {0,1,2,3,4,5,6,7,8,9} total 10 elemen

B = {a,b,c} total 3 elemen

BA berisi pasangan dari semua ordo. Mudahnya, tiap satu elemen A harus dipasangkan dengan ketiga elemen B secara terpisah. contoh : 0a, 0b, 0c. maka setelahnya akan berganti menjadi 1a, 1b, 1c, dan seterusnya

BA = { (0,a), (0,b), (0,c), (1,a), (1,b), (1,c), (2,a), (2,b), (2,c), (3,a), (3,b), (3,c), (4,a), (4,b), (4,c), (5,a), (5,b), (5,c), (6,a), (6,b), (6,c), (7,a), (7,b), (7,c), (8,a), (8,b), (8,c), (9,a), (9,b), (9,c) }