推 santa:只考慮條件2時,m可以等於3 or 3x7 無法判斷有幾個質因數 09/10 00:23
→ oranger:原來如此 了解了 謝謝!! 09/11 23:35
183.
If m is a positive odd integer between 2 and 30, then m is divisible by how
many different positive prime numbers?
(1) m is not divisible by 3.
(2) m is not divisible by 5.
Ans: A
我選D耶 因為我覺得都可以列出來所以都可以算
不知道是哪裡理解錯誤了, 請高人指點~~ 謝謝
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 220.129.123.213