Any set of boolean operators that is sufficient to represent all boolean expression is called complete. Which of the following is NOT complete?
(A) {→, ↚}
(B) {→, ¬}
(C) {↑}
(D) None of these


Answer: (D)

Explanation: Given sets {→, ↚}, {→, ¬}, and {↑} are functional complete sets.

So, option (D) is correct.

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