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

माना संख्याएं \(2, b , c\) एक समान्तर श्रेढ़ी में है तथा \(A =\left[\begin{array}{ccc}1 & 1 & 1 \\ 2 & b & c \\ 4 & b ^{2} & c ^{2}\end{array}\right]\). यदि \(\operatorname{det}( A ) \in[2,16]\), तो \(c\) निम्न में से किस अन्तराल में है 

  1. A \([3,2 + 2^{2/4} ]\)
  2. B \((2 + 2^{3/4},4)\)
  3. C \((2,3)\)
  4. D \([4, 6]\)
Verified Solution

Answer & Solution

Correct Answer

(D) \([4, 6]\)

Step-by-step Solution

Detailed explanation

\(\left| {\begin{array}{*{20}{c}} 1&1&1\\ 2&b&c\\ 4&{{b^2}}&{{c^2}} \end{array}} \right|\) \({C_2} \to {C_2} - {C_1},{C_3} \to {C_3} - {C_1}\) \( \Rightarrow \left| {\begin{array}{*{20}{c}} 1&0&0\\ 2&{b - 2}&{c - 2}\\ 4&{{b^2} - 4}&{{c^2} - 4} \end{array}} \right|\)…
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