P2-DS-183

由 **sunnyblue13s** » 2008-05-23 11:34

183. 17831-!-item-!-187;#058&011633
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.

(A)

由 **Huang Hsin-Yi** » 2008-05-23 12:07

把14個數列出來就知道了

由 **sunnyblue13s** » 2008-05-23 13:44

列出來了~~那25要怎麼解釋ㄚ??

由 **chencraig0227** » 2008-05-23 13:53

sunnyblue13s \$m[1]:列出來了~~那25要怎麼解釋ㄚ??

M=25
可以被1, 5, 25整除
不過25不是質數所以還是只有兩個"質"數可以整除M.

由 **Huang Hsin-Yi** » 2008-05-23 16:15

sunnyblue13s \$m[1]:183. 17831-!-item-!-187;#058&011633
If m is a positive odd integer between 2 and 30, then m is divisible by how many different positive prime numbers?

I think that you may ignore the red part.

(1) m is not divisible by 3.

(2) m is not divisible by 5.

(A)

P2-DS-183

P2-DS-183

Re: P2-DS-183

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