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7 X 3 = 21 letak satu simpan 2
4 X 3 = 12 ditambah 2, 14 letak 14 simpan satu
1 X 3 = 3 dtambah 1 = 4
lalu
2 X 7 = 14 ditambah 4 = 18 letak delapan simpan 1
2 X 4 = 8 ditambah 4 ditambah 1 = 13 letak tiga simpan 1
1 X 2 = 2 ditambah 1 = 3 letak tiga
menjadi hasilnya 3381