In a scenario where a set is defined as {x | x is an integer and x > 0}, whic

Practice Questions

Q1
In a scenario where a set is defined as {x | x is an integer and x > 0}, which of the following is a valid operation on this set?
  1. Adding a negative integer.
  2. Removing all even integers.
  3. Finding the union with the set of all negative integers.
  4. Finding the intersection with the set of all positive integers.

Questions & Step-by-Step Solutions

In a scenario where a set is defined as {x | x is an integer and x > 0}, which of the following is a valid operation on this set?
  • Step 1: Understand the set definition. The set is defined as {x | x is an integer and x > 0}. This means it includes all positive integers (1, 2, 3, ...).
  • Step 2: Identify the operation to perform. We are looking for a valid operation on this set, such as finding the intersection with another set.
  • Step 3: Define the second set. The second set is the set of all positive integers, which is also {y | y is an integer and y > 0}.
  • Step 4: Perform the intersection operation. The intersection of the two sets is the set of elements that are in both sets.
  • Step 5: Analyze the intersection. Since both sets contain the same elements (all positive integers), the intersection will yield the original set {x | x is an integer and x > 0}.
  • Step 6: Conclude that the operation is valid. Finding the intersection with the set of all positive integers does not change the original set.
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