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Limx→1xm-1xn-1 is ______. - Mathematics

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प्रश्न

`lim_(x -> 1) (x^m - 1)/(x^n - 1)` is ______.

विकल्प

  • 1

  • `m/n`

  • `- m/n`

  • `m^2/n^2`

MCQ
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उत्तर

`lim_(x -> 1) (x^m - 1)/(x^n - 1)` is `m/n`.

Explanation:

Given, `lim_(x -> 1) (x^m - 1)/(x^n - 1)`

= `lim_(x -> 1) ((x^m - (1)^m)/(x - 1))/((x^n - (1)^n)/(x - 1))`

= `(m(1)^(m - 1))/(n(1)^(n - 1))`

= `m/n`  .....`[because  lim_(x -> a) (x^n - a^n)/(x - a) = na^(n - 1)]`

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अध्याय 13: Limits and Derivatives - Exercise [पृष्ठ २४२]

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एनसीईआरटी एक्झांप्लर Mathematics [English] Class 11
अध्याय 13 Limits and Derivatives
Exercise | Q 57 | पृष्ठ २४२

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