Given d = {x | x is a whole number}. e = {x | x is a perfect square between 49 and 100}. f = {x | x is an even number between 10 and 20}. 1.the expression d∪f means (64 and 81) or (all whole numbers). 2.the expression d∩f means (16,22,24,18) or (12,14,16,18). 3.the expression d∩e means (all whole numbers) or (64,81). 4.the expression e∩f means (all whole numbers) or (empty set). 5.the expression d∩(e∪f) means (empty set) or (81,64,12,14,16,18)