The matrix \(\begin{bmatrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{bmatrix}\) is a : (A) scalar matrix (B) diagonal matrix (C) skew-symmetric matrix (D) symmetric matrix

For a square matrix \(A_{n\times n}\) (A) \(|\operatorname{adj} A| = |A|^{n-1}\) (B) \(|A| = |\operatorname{adj} A|^{n-1}\) (C) \(A(\operatorname{adj} A) = |A|\) (D) \(|A^{-1}| = \frac{1}{|A|}\) Choose the correct answer from the options given below :

The feasible region represented by the constraints \(4x + y \ge 80, x + 5y \ge 115, 3x + 2y \le 150, x, y \ge 0\) of an LPP is [Figure: graph with x and y axes showing the three lines. Marked points: (0,80), (0,75), (2,72), (0,23), (15,10), (40,15), (20,0), (50,0), (115,0) and th…

If the random variable X has the following distribution : X | 0 | 1 | 2 | otherwise P(X) | k | 2k | 3k | 0 Match List-I with List-II : List-I | List-II (A) k | (I) \(\frac{5}{6}\) (B) P(X < 2) | (II) \(\frac{4}{3}\) (C) E(X) | (III) \(\frac{1}{2}\) (D) P(1 \(\le\) X \(\le\) 2) |…

The area of the region enclosed between the curves \(4x^2 = y\) and \(y = 4\) is:

\(\int_0^{\pi/2} \frac{1 - \cot x}{\operatorname{cosec} x + \cos x}\,dx =\)

\(\int e^x \left(\frac{2x+1}{2\sqrt{x}}\right) dx =\)

If the function \(f: \mathbb{N} \to \mathbb{N}\) is defined as \(f(n) = n - 1\) if \(n\) is even, and \(f(n) = n + 1\) if \(n\) is odd, then (A) f is injective (B) \(f\) is into (C) \(f\) is surjective (D) f is invertible Choose the correct answer from the options given below :

If \(f(x)\), defined by \(f(x) = kx + 1\) if \(x \le \pi\) and \(f(x) = \cos x\) if \(x > \pi\), is continuous at \(x = \pi\), then the value of \(k\) is :