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Magazine Problem 73
In Exercises 67-80, find the cardinal number for each set. \(D=\\{\) five \(\\}\)
Problem 74
In Exercises 67-80, find the cardinal number for each set. \(D=\\{\operatorname{six}\\}\)
Problem 75
In Exercises 67-80, find the cardinal number for each set. \(A=\\{x \mid x\) is a letter in the word five \(\\}\)
Problem 75
In Exercises 69-82, determine whether each statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. \(\varnothing \in\\{\varnothing,\\{\varnothing\\}\\}\)
Problem 76
In Exercises 67-80, find the cardinal number for each set. \(A=\\{x \mid x\) is a letter in the word \(\operatorname{six}\\}\)
Problem 76
In Exercises 69-82, determine whether each statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. \(\\{\varnothing\\} \in\\{\varnothing,\\{\varnothing\\}\\}\)
Problem 77
In Exercises 67-80, find the cardinal number for each set. \(B=\\{x \mid x \in \mathbf{N}\) and \(2 \leq x<7\\}\)
Problem 77
In Exercises 69-82, determine whether each statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. If \(A \subseteq B\) and \(d \in A\), then \(d \in B\).
Problem 78
In Exercises 67-80, find the cardinal number for each set. \(B=\\{x \mid x \in \mathbf{N}\) and \(3 \leq x<10\\}\)
Problem 78
In Exercises 69-82, determine whether each statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. If \(A \subseteq B\) and \(B \subseteq C\), then \(A \subseteq C\).
