Which of the following is an example of a ternary predicate?单项选择题

A

a. A function called allUnique(A, B, C) which is True if the values of A, B, and C are all different, and False otherwise.

B

b. A function called divideByThree(X) which gives the value of X divided by 3.

C

c. A function called divisibleByThree(X) which is True if X is divisible by 3, and False otherwise.

D

d. A function called average(A, B, C) which gives the average of the numerical values A, B, and C.

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In class, I asserted that  is the same as , where and are predicates. That is, you can "not" or "negate" a predicate that is itself a conjunction of predicates by distributing the "not" over the inner predicates, and changing the "and" to an "or". Using this rule, and the fact that is equivalent to and also that is equivalent to , we can argue that  can be re-written as what? 

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Which of the following is not an example of a predicate?

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