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

ऐसे सभी \(3 \times 3\) आव्यूहों \(A\) की संख्या, जिसके अवयव समुच्चय \(\{-1,0,1\}\) से हैं तथा \(AA ^{ T }\) के विकर्ण के अवयवों का योगफल \(3\) है

  1. A \(632\)
  2. B \(672\)
  3. C \(682\)
  4. D \(638\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(672\)

Step-by-step Solution

Detailed explanation

\(\operatorname{trace}\left(\mathrm{AA}^{\mathrm{T}}\right)=\Sigma \mathrm{a}_{\mathrm{ij}}^{2}=3\) Hence, number of such matrices \(=^{9} \mathrm{C}_{3} \times 2^{3}=672.00\)
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app