1.

1). 642). 723). 804). 81

Answer»

$(\begin{array}{L}\SQRT {1 + \;\frac{X}{{361}}}= \frac{{21}}{{19}}\\ \Rightarrow 1 + \frac{x}{{361}}\; = \frac{{{{21}^2}}}{{{{19}^2}}}\\ \Rightarrow \frac{{361 + x}}{{361}} = \frac{{441}}{{361}}\END{array})$ 

⇒ 361 + x = 441

⇒ x = 441 – 361 = 80

∴ x = 80


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