C and D are sets of real numbers defined as follows.

Question

C= {x│x ≤ 2}

D= {x│x > 5}

Write C U D and C ∩ D using interval notation. If the set is empty, write Ø

Answer 1

C ∩ D is empty, i.e. the null set, ∅

C ∪ D = (-∞,2] ∪ (5,∞)