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JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant

माना \(A =\left(\begin{array}{ccc}{[ x +1]} & {[ x +2]} & {[ x +3]} \\ {[ x ]} & {[ x +3]} & {[ x +3]} \\ {[ x ]} & {[ x +2]} & {[ x +4]}\end{array}\right)\), जहाँ [t]महत्तम पूर्णांक \(\leq t\) को दर्शाता है। यदि \(\operatorname{det}( A )=192\) है, तो \(x\) के मानों का समुच्चय निम्न में से कौन सा अन्तराल है?

  1. A \([68,69)\)
  2. B \([62,63)\)
  3. C \([65,66)\)
  4. D \([60,61)\)
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Correct Answer

(B) \([62,63)\)

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\(\left|\begin{array}{ccc}{[x+1]} & {[x+2]} & {[x+3]} \\ {[x]} & {[x+3]} & {[x+3]} \\ {[x]} & {[x+2]} & {[x+4]}\end{array}\right|=192\) \(\mathrm{R}_{1} \rightarrow \mathrm{R}_{1}-\mathrm{R}_{3} \;and\; \mathrm{R}_{2} \rightarrow \mathrm{R}_{2}-\mathrm{R}_{3}\)…
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