Question

If S = {x,y,4,9,?) , which could describe U ?

A; U= { keys on a keyboard}
B; U= { letters }
C; U= { numbers }
D; U= { punctuation marks }

Answer 1

keys on a keyboard

Explanation:

Answer 2

Answer:- A) U= { keys on a keyboard}

Explanation:-

• A set is a well defined collection of objects.
• A Universal set is the set containing all objects and all other sets are subsets of the universal set. It is denoted by 'U'.

Given set : S = {x,y,4,9,?}

Clearly it contains numbers (4,9), alphabets(x,y) and punctuation mark(?).

Thus the universal set of the given set must contain all of them.

Thus U={keys on a keyboard}