Question

find the product 209×191 using suitable formula​

Answer 1

$209 \times 191 \\ = (200 + 9)(200 - 9) \\ = {200}^{2} - {9}^{2} \: \: \: \: \: \: \: |because \: (x + y)(x - y) = {x}^{2} - {y}^{2} \\ = 40000 - 81 \\ = 39919$

Answer 2

Step-by-step explanation:

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