If E = {x | x is a prime number less than 10}, what is the power set of E?

Practice Questions

Q1
If E = {x | x is a prime number less than 10}, what is the power set of E?
  1. {∅, {2}, {3}, {5}, {7}, {2, 3}, {2, 5}, {2, 7}, {3, 5}, {3, 7}, {5, 7}, {2, 3, 5}, {2, 3, 7}, {2, 5, 7}, {3, 5, 7}, {2, 3, 5, 7}}
  2. {∅, {2, 3, 5, 7}}
  3. {∅, {2}, {3}, {5}, {7}}
  4. {∅, {2, 3}, {5, 7}}

Questions & Step-by-Step Solutions

If E = {x | x is a prime number less than 10}, what is the power set of E?
  • Step 1: Identify the prime numbers less than 10. The prime numbers are 2, 3, 5, and 7.
  • Step 2: Write the set of prime numbers as E = {2, 3, 5, 7}.
  • Step 3: Determine the number of elements in set E. There are 4 elements in E.
  • Step 4: Calculate the power set of E. The power set is the set of all possible subsets of E.
  • Step 5: Use the formula for the number of subsets: 2^n, where n is the number of elements in the set. Here, n = 4.
  • Step 6: Calculate 2^4, which equals 16. This means the power set has 16 elements.
  • Set Theory – Understanding sets, subsets, and the concept of a power set, which is the set of all subsets of a given set.
  • Prime Numbers – Identifying prime numbers and understanding their properties, particularly in relation to the specified range.
  • Exponential Growth – Calculating the number of subsets in a power set using the formula 2^n, where n is the number of elements in the original set.
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