s is a subset within a universal set, u. if s = {x, y, 4, 9,?}, which could describe u? o u = {keys on a…

s is a subset within a universal set, u. if s = {x, y, 4, 9,?}, which could describe u? o u = {keys on a keyboard} o u = {letters} o u = {numbers} o u = {punctuation marks}

s is a subset within a universal set, u. if s = {x, y, 4, 9,?}, which could describe u? o u = {keys on a keyboard} o u = {letters} o u = {numbers} o u = {punctuation marks}

Answer

Explanation:

Step1: Analyze elements in S

Set S contains letters (x, y), numbers (4, 9) and a punctuation - like symbol (?).

Step2: Check each option

  • Option 1: The set of keys on a keyboard contains letters, numbers and punctuation marks, which can include all elements of S.
  • Option 2: The set of letters only contains letters and not numbers or punctuation marks, so it cannot be U.
  • Option 3: The set of numbers only contains numbers and not letters or punctuation marks, so it cannot be U.
  • Option 4: The set of punctuation marks only contains punctuation marks and not letters or numbers, so it cannot be U.

Answer:

U = {keys on a keyboard}