1. A certain medication is to be taken at the rate of one tablet every 12 hours. Approximately how many weeks will a prescription of 100 tablets last? answer:7 week 但是 12 hours 吃1个 1天->2个 100个-> 50天 =7 weeks +1天 应该是8周阿 2. a certain holiday is always on the fourth Tuesday of Month X. If Month X has 30 days, on how many different dates of Month X can the holiday fall? 完全不懂意思 也不知道怎麽求 请好心的人 解释一下 并列式谢谢 ans: seven 3. how many positive integrers can be expressed as a product of two or more of the prime number 5, 7, 11, and 13 if no one product is to include the same prime factor more than once? anwser: 11 这好像是机率 4个中选2个以上来乘积 但是不知道怎麽算耶 我原本想 取四个 只有一种 取三个 只有4种 (一个数拿掉其他相乘) 取两个 只有4种 ４个取２个　　 　　　　　　　　　　　共九种阿　　怎麽会１１？ 　　　　 --

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