[Q. ] PP1.DS93
B93. 8525-!-item-!-187;#058&006006
If the integer n is greater than 1, is n equal to 2 ?
(1) n has exactly two positive factors.
(2) The difference of any two distinct positive factors of n is odd.
題目問n>1,n=2嗎?
1.n有兩個因數
2.n的任兩個正因數相減是奇數。
1.不充分可以理解,n可能是2=1*2,也可能不是2,隨便舉很多數都有兩個以上的因數。
問題點:
2.隨便假設n=28,因數7-4=3(奇數)-->n不等於2
假設n=2 ,因數2-1=1(奇數)-->n等於2
不知答案為何是B?
Please help................
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