1) List all the elements in A = {letters in the word “book”} a) A = {b, o, k} b) A = {b, o, o, k} c) A = {b, k} d) A = Ø 2) The number of elements of the set {vowels in the word “MATHEMATICS”} a) 3 b) 4 c) 7 d) 10 3) Which of the following is a well-defined set? a) {a happy child} b) {a popular TV series} c) {a favorite book by my classmates} d) {a Mathematics Book in the library} 4) List the set Set of prime numbers less than 20 a) {2, 4, 6, 7, 11, 13, 17, 19} b) {2, 3, 5, 7, 11, 13, 17, 19} c) {2, 3, 5, 7} d) {1, 2, 3, 5, 7, 11, 13, 17, 19} 5) All the following represent sets except a) Perfect numbers b) Wonderful movies c) Multiples of 25 d) Ordering numbers

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