JEE MATHEMATICS MCQ: MATRICES

1 Hard

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Application +4 | -1

If the matrix

M_r

is given by

M_r=\left[\begin{array}{cc}r & r-1 \\ r-1 & r\end{array}\right], r=1,2,3 \ldots

. Then the value of

\operatorname{det}\left(M_1\right)+\operatorname{det}\left(M_2\right)+

...

+\operatorname{det}\left(\mathrm{M}_{2009}\right)

View answer and explanation

Correct option: C

(2009)^2

Option C (

(2009)^2

) is correct because the determinant of

M_r

2r-1

, and the sum of the determinants from

r=1

r=2009

is the sum of the first 2009 odd numbers, which equals

2009^2

More Questions from MATRICES

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\left|\begin{array}{ccc}a & b-c & b+c \\ c+a & b & c-a \\ a-b & a+b & c\end{array}\right|=0

a, b, c

a x+b y+c=0

{x_2} - {x_3} = 1,\; - {x_1} + 2{x_3} = - 2,\;{x_1} - 2,\;{x_1} - 2{x_2} = 3

2x + 3y + 1 = 0,3x + y - 2 = 0

ax + 2y - b = 0

\left|\begin{array}{ccc}1 & \left(\alpha^{2 x}-\alpha^{-2 x}\right)^2 & \left(\alpha^{2 x}+\alpha^{-2 x}\right)^2 \\ 1 & \left(\beta^{2 x}-\beta^{-2 x}\right)^2 & \left(\beta^{2 x}+\beta^{-2 x}\right)^2 \\ 1 & \left(\gamma^{2 x}-\gamma^{-2 x}\right)^2 & \left(\gamma^{2 x}+\gamma^{-2 x}\right)^2\end{array}\right|

\omega

\left| {\begin{array}{cccccccccccccccccccc} 1&\omega &{{\omega ^2}}\\ \omega &{{\omega ^2}}&1\\ {{\omega ^2}}&1&\omega \end{array}} \right|

A

2 \times 2

A(\operatorname{adj} A)=\left[\begin{array}{cc}10 & 0 \\ 0 & 10\end{array}\right]

|A|