ISRO CSE 2018 PYQ

Detailed Explanation:

A named pipe (FIFO) is a special file type in Unix filesystem.

Data in a pipe is transient (stored in kernel buffers, deleted as read).

Pipes are sequential byte streams and forbid random access (lseek).

Detailed Explanation:

Total seats = 5 rows * 8 seats/row = 40 seats.

Total students = 30, so empty seats = 40 - 30 = 10 seats.

Detailed Explanation:

For $\log(u)$ to be defined, u > 0. Here $u = \log(\sin(x))$.

For $\log(\sin(x)) > 0, we must have \sin(x) > 1$.

However, $\sin(x) \le 1$ for all real x.

Therefore, $\log(\sin(x)) \le 0$ for all x, so $\log(\log(\sin(x)))$ is undefined everywhere.

Detailed Explanation:

The Subset Sum problem is a classic NP-complete problem.

Detailed Explanation:

In an abelian group, commutativity holds: x * $y = y \cdot x$.