Question

The value of \[\left| {\begin{array}{*{20}{c}} {^{10}{C_4}}&{^{10}{C_5}}&{^{11}{C_m}} \\ {^{11}{C_6}}&{^{11}{C_7}}&{^{12}{C_{m + 2}}} \\ {^{12}{C_8}}&{^{12}{C_9}}&{^{13}{C_{m + 4}}} \end{array}} \right|\]     is equal to zero when $$m$$ is

A. 6
B. 4
C. 5  
D. None of these
Answer :   5
Solution :
\[{C_2} \to {C_2} + {C_1}\,\,{\text{given }}\vartriangle = \left| {\begin{array}{*{20}{c}} {^{10}{C_4}}&{^{11}{C_5}}&{^{11}{C_m}} \\ {^{11}{C_6}}&{^{12}{C_7}}&{^{12}{C_{m + 2}}} \\ {^{12}{C_8}}&{^{13}{C_9}}&{^{13}{C_{m + 4}}} \end{array}} \right|\]
For $$m = 5,{C_2} \equiv {C_3}.$$

Releted MCQ Question on
Algebra >> Matrices and Determinants

Releted Question 1

Consider the set $$A$$ of all determinants of order 3 with entries 0 or 1 only. Let $$B$$  be the subset of $$A$$ consisting of all determinants with value 1. Let $$C$$  be the subset of $$A$$ consisting of all determinants with value $$- 1.$$ Then

A. $$C$$ is empty
B. $$B$$  has as many elements as $$C$$
C. $$A = B \cup C$$
D. $$B$$  has twice as many elements as elements as $$C$$
Releted Question 2

If $$\omega \left( { \ne 1} \right)$$  is a cube root of unity, then
\[\left| {\begin{array}{*{20}{c}} 1&{1 + i + {\omega ^2}}&{{\omega ^2}}\\ {1 - i}&{ - 1}&{{\omega ^2} - 1}\\ { - i}&{ - i + \omega - 1}&{ - 1} \end{array}} \right|=\]

A. 0
B. 1
C. $$i$$
D. $$\omega $$
Releted Question 3

Let $$a, b, c$$  be the real numbers. Then following system of equations in $$x, y$$  and $$z$$
$$\frac{{{x^2}}}{{{a^2}}} + \frac{{{y^2}}}{{{b^2}}} - \frac{{{z^2}}}{{{c^2}}} = 1,$$    $$\frac{{{x^2}}}{{{a^2}}} - \frac{{{y^2}}}{{{b^2}}} + \frac{{{z^2}}}{{{c^2}}} = 1,$$    $$ - \frac{{{x^2}}}{{{a^2}}} + \frac{{{y^2}}}{{{b^2}}} + \frac{{{z^2}}}{{{c^2}}} = 1$$     has

A. no solution
B. unique solution
C. infinitely many solutions
D. finitely many solutions
Releted Question 4

If $$A$$ and $$B$$ are square matrices of equal degree, then which one is correct among the followings?

A. $$A + B = B + A$$
B. $$A + B = A - B$$
C. $$A - B = B - A$$
D. $$AB=BA$$

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