1) {January, February, March, April, May, June, July, August, September, October, November, December}
2) {40, 42, 44, 46, ..., 100}
3) {1, 3, 5, 7, 9, 11, 13, 15, 17, 19}
4) {x | x ā N and x > 9}
5) {Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}
6) {x | x < 10 and x > 14}
7) {x | x is a day of the week whose name begins with the letter Y}