Which of the following sets is NOT an empty set? Select one: a. The set of natural numbers less than zero O b. The set of vowel letters in the word "empty" Oc {() C {) O d. The set of natural numbers less than 1 Which of the following is NOT a subset of {a,b}? Select one: O a. (a b) b. (a) Oc. {b} O d. b

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