1.

-19 / 21 x ( -21/ 19 ) =​

Answer» <html><body><p>1Step-by-step <a href="https://interviewquestions.tuteehub.com/tag/explanation-455162" style="font-weight:bold;" target="_blank" title="Click to know more about EXPLANATION">EXPLANATION</a>:-19/21*-21/19here both 19 and 21 are <a href="https://interviewquestions.tuteehub.com/tag/cancelled-2014201" style="font-weight:bold;" target="_blank" title="Click to know more about CANCELLED">CANCELLED</a> so -<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a> and -1 are <a href="https://interviewquestions.tuteehub.com/tag/left-1070879" style="font-weight:bold;" target="_blank" title="Click to know more about LEFT">LEFT</a> so -1*-1 is 1</p></body></html>


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