Maths by Amit Verma

 2 mark

| -0.25 mark |

 60 minutes

 Watch Video

Question 1:

If
\[ A = \begin{bmatrix} y & z & x \\ z & x & y \\ x & y & z \end{bmatrix} \]
where \(x, y, z\) are integers, is an orthogonal matrix, then what is the value of \(x^{2}+y^{2}+z^{2}\)?

Question 2:

If
\[
\left[\begin{array}{lll}
x & 1 & 1
\end{array}\right]\left[\begin{array}{lll}
1 & 2 & 3 \\
4 & 5 & 6 \\
7 & 8 & 9
\end{array}\right]\left[\begin{array}{l}
1 \\
1 \\
x
\end{array}\right]=[45]
\]
then which one of the following is a value of x?

Question 3:

If the sum of binomial coefficients in the expansion of \((x+y)^{n}\) is 256, then the greatest binomial coefficient occurs in which one of the following terms?

Question 4:

How many 7-letter words (with or without meaning) can be constructed using all the letters of the word CAPITAL so that all consonants come together in each word?

Question 5:

In how many ways can the letters of the word DELHI be arranged keeping the positions of vowels and consonants unchanged?

Question 6:

If \( k<(\sqrt{2}+1)^{3}