3. What’s difference between batch systems, multi programmed systems and time sharing systems?

answer:

batch system is one in which jobs are bundled together with the instructions necessary to allow them to be processed without intervention.

multitasking is a method by which multiple tasks, also known as processes, share common processing resources such as a CPU. In the case of a computer with a single CPU, only one task is said to be running at any point in time, meaning that the CPU is actively executing instructions for that task.

Time-sharing is sharing a computing resource among many users by multitasking.