Untitled

 2 mark

| -0.25 mark |

 60 minutes

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 [x 1 1] [1 2 3; 4 5 6; 7 8 9] [1; 1; x] = [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:

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

Question 5:

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 6:

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