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The summing outputs of a half or full-adder are designated by which Greek symbol?

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The summing outputs of a half or full-adder are designated by which Greek symbol?

(a) Omega

(b) Theta

(c) Lambda

(d) Sigma

This question was addressed to me in semester exam.

The above asked question is from 4-Bit Parallel Adder/Subtractor in division Arithmetic Circuits of Digital Circuits

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Correct choice is (d) Sigma

Easy explanation: The summing outputs of a half or full-adder are designated by “sigma” which is a Greek symbol. This same symbol is used to signify the Minterms in case of an SOP expression.

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