Question

39×41 using identity​

Answer 1

Answer:

39*41

(40-1)(40+1)

40²-1²

1600-1

1599

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Answer 2

39*41
(40-1) (40 +1) (a+b) (a-b) = (a^2-b^2)
Now,
(40)^2 - (1)^2
1600 - 1
1599

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