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

माना \(S =\left\{\left(\begin{array}{cc}-1 & a \\ 0 & b \end{array}\right) ; a , b \in\{1,2,3, \ldots 100\}\right\}\) तथा माना \(T _{ n }=\left\{ A \in S : A ^{ n ( n +1)}= I \right\}\) है, तो \(\bigcap \limits_{n=1}^{100} T_n\) में अवयवों की संख्या होगी

  1. A \(50\)
  2. B \(85\)
  3. C \(100\)
  4. D \(137\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(100\)

Step-by-step Solution

Detailed explanation

\(A=\left[\begin{array}{cc}-1 & a \\ 0 & b\end{array}\right]\) \(A^{2}=\left[\begin{array}{cc}-1 & a \\ 0 & b\end{array}\right]\left[\begin{array}{cc}-1 & a \\ 0 & b\end{array}\right]\) \(=\left[\begin{array}{cc}1 & -a+a b \\ 0 & b^{2}\end{array}\right]\)…
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app