B={x:x+5=5} is not an empty set. Why?

Empty set is

Answer the following question and Justify your answer. B={x:x +5=5}. It is a null set or a universal set?

Which of the following is an empty set

Which of the following sets are empty sets? Justify your answer A= {x:x^2=4 and 3x=9}

Which of the following sets are empty sets? Justify your answer. A = {x : x^(2) = 4 ""and"" 3 x = 9}.

The number of elements in the empty set is

IF A={x:x is a natural number}, B={x:x is an even natural number}, C={x:x is an odd natural number}, then Find. A cap B,A cap C , A-B ,A-C and describes sets in set builder form.