1 Himpunan bilangan ganjil antara 8 dan 21 adalah… a. {9, 10, 12, 15, 17, 21} c. {11, 13, 15, 17, 21} b. {8, 10, 12, 14, 16, 18, 20} d. {9, 11, 13, 15, 17, 19}