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The basic building blocks of the arithmetic unit in digital computers are __________

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The basic building blocks of the arithmetic unit in digital computers are __________

(a) Subtractors

(b) Adders

(c) Multiplexer

(d) Comparator

This question was posed to me during an online exam.

This question is from Introduction of Arithmetic Operation topic in portion Arithmetic Circuits of Digital Circuits

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Right option is (b) Adders

Explanation: The basic building blocks of the arithmetic unit in digital computers are adders. Since a parallel adder is constructed with a number of full-adder circuits connected in cascade. By controlling the data inputs to the parallel adder, it is possible to obtain different types of arithmetic operations.

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