Question

The set A and set B are defined as
A = {x : x is a natural number}
B = {-x : x is a whole number}
The union of set A and set B is a set of all .

• A. Integers
• B. Rational Numbers
• C. Real Numbers
• D. Integers except 0.

Answer 1

The correct option is A Integers

A={x : x is a natural number}= {1, 2, 3, 4, ......}
B={-x : x is a whole number}={0, -1, -2, -3,......}

A U B = {.....-3, -2, -1, 0, 1, 2, 3,.....} which is a set of all integers.