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

\(3 \times 3\) के आव्यूहों \(A\), जिनके अवयव समुच्चय \(\{0,1,2,3\}\) में से हैं तथा \(AA ^{ T }\) के विकर्ण के सभी अवयवों का योगफल \(9\) है, की कुल संख्या है 

  1. A \(728\)
  2. B \(712\)
  3. C \(824\)
  4. D \(766\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(766\)

Step-by-step Solution

Detailed explanation

Let \(A =\left[\begin{array}{lll} a & b & c \\ d & e & f \\ g & h & i \end{array}\right]\) diagonal elements of \(AA ^{ T }, \quad a ^{2}+ b ^{2}+ c ^{2}, d ^{2}+ e ^{2}+ f ^{2}, g ^{2}+ b ^{2}+ c ^{2}\) Sum \(=a^{2}+b^{2}+c^{2}+d^{2}+e^{2}+f^{2}+g^{2}+h^{2}+i^{2}=9\)…
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