let andWhat is AxB? | ICStudy

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Single Choice

let

$A = (\sqrt{2} + \sqrt{3})(\sqrt{4} + \sqrt{5}) ... (\sqrt{2020} + \sqrt{2021})$ and

$B = (\sqrt{2021} - \sqrt{2020})(\sqrt{2019} - \sqrt{2018}...(\sqrt{3} - \sqrt{2})$

What is AxB?

A.

1

B.

$\sqrt{2021} - \sqrt{2}$

C.

$\sqrt{4042}$

D.

$\sqrt{2020\times2021} - \sqrt{2\times3}$

E.

2020

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