有幾題選不到答案..
59. If k =/= 0, 1, or -1, is 1/K > 0 ?
(1) 1 / K-1> 0
(2) 1 / K+1 > 0
answer is A.
{想知道為什麼(2)資料不不充份?}
60. Does the integer K have a factor p such that 1<p<k ?
(1) k > 4!
(2) 13!+2 <= k <= 13!+13
answer is B.
{題目不了。題目是問 K整數有 P因數,範圍在 1<P<K,題意不知是不是這樣? 如果是這樣的話,那該怎麼解}
62. If y >= 0, what is the value of x ?
(1) |x-3| >= y
(2) |x-3| <= y
answer is B.
{ (1)沒有問題,但不了解why (B) 是充份的? }
thanks a lot.