Question

Please answer the question correct​

Answer 1

Answer:

159991

Step-by-step explanation:

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Answer 2

Answer:

399 × 401 = 159999

Step-by-step explanation:

Identity which is used is $(a - b) (a + b) = a^2 - b^2$

Using suitable identity evaluate: 399 × 401

399 × 401

= (400 - 1) (400 + 1)

$= (400)^2 - (1)^2\\= 160000 - 1\\= 159999$

399 × 401 = 159999