explain this sum
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Explanation:
A = 3 - 1
2 1
B = 3 0
1 - 2
AB = 9 0
2 - 2
Method = 3 × 3 =9
- 1 × 0 = 0
2 × 1 = 2
1 × - 2 = - 2
Multiply the digits A column digits with B coloumn digits without changing the places
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