FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Alternatively called the counting frame, an abacus is a mechanical device used to assist a person in performing mathematical calculations and counting.

Detailed explanation-2: -Both the abacus and the counting board are mechanical aids used for counting; they are not calculators in the sense we use the word today. The person operating the abacus performs calculations in their head and uses the abacus as a physical aid to keep track of the sums, the carrys, etc.

Detailed explanation-3: -An abacus is a calculation tool used by sliding counters along rods or grooves, used to perform mathematical functions. In addition to calculating the basic functions of addition, subtraction, multiplication and division, the abacus can calculate roots up to the cubic degree.

Detailed explanation-4: -The first calculating device that was invented was the Abacus. It is a manual calculating device that consists of rows of beads representing a place of value and digits. The abacus was invented by Blaise Pascal in the year 1642.

Detailed explanation-5: -The correct answer is a Mechanical calculator. It was the first mechanical calculator.