C and D are consider to be sets of real numbers defined as the following help find the CUD and cnd using interval notation?

Question

C={yly>=1},D={yly<7} what is the C∪D and the C∩D using interval notation?

Answer 1

C∪D is the union of all numbers in the solutions set.

C∩D is the intersection of all numbers in the set.  Numbers that both sets have in common.

 

C∪D = (-∞, ∞)

C∩D = [1, 7)