Question:
State in each case whether A ⊂ B or A ⊄ B.
A = {x : x is a real number,}, B = {x : x is a complex number}
Solution:
A ⊂ B
Explanation: we have, A = set of real numbers and B = set of complex numbers, a combination of the real and imaginary number in the form of a+ib, where a and b are real, and i is imaginary.
Since, any real number can be expressed as complex number, A ⊂ B.