br_cspr Posted April 14, 2007 Share Posted April 14, 2007 If y ≠ 3 and is a prime integer greater than 2, which of the following must be true? Ⅰ. x = y Ⅱ. y = 1 Ⅲ. x and y are prime integers. (A) None (B) Ⅰ only © Ⅱonly (D) Ⅲonly (E) Ⅰand Ⅲ The answer is said to be A. I got B. Quote Link to comment Share on other sites More sharing options...
Kuba Posted April 16, 2007 Share Posted April 16, 2007 But 1 is not a prime number...1 is not even greater than 2. So it can't be B. It's a weird question anyway, because x is not mentioned in it at all...so yes, I'd choose A. Quote Link to comment Share on other sites More sharing options...
laramaria Posted April 16, 2007 Share Posted April 16, 2007 I agree. x is not mentioned in the question at all. Something must be missing. Could you please check the question again! Quote Link to comment Share on other sites More sharing options...
br_cspr Posted April 18, 2007 Author Share Posted April 18, 2007 you are right. i found the missing peice. here it is...the question reads... If y ≠ 3 and 3x/y is a prime integer greater than 2, which of the following must be true? Ⅰ. x = y Ⅱ. y = 1 Ⅲ. x and y are prime integers. (A) None (B) Ⅰ only © Ⅱonly (D) Ⅲonly (E) Ⅰand Ⅲ im sorry abt the error. i did a copy paste and it seems the 3x/y is in a diff box and does not copy onto this screen. http://www.www.urch.com/forums/images/icons/icon9.gif pls help with the solution. Quote Link to comment Share on other sites More sharing options...
0riginal Posted April 19, 2007 Share Posted April 19, 2007 you are right. i found the missing peice. here it is...the question reads... If y ≠ 3 and 3x/y is a prime integer greater than 2, which of the following must be true? Ⅰ. x = y Ⅱ. y = 1 Ⅲ. x and y are prime integers. (A) None (B) Ⅰ only © Ⅱonly (D) Ⅲonly (E) Ⅰand Ⅲ im sorry abt the error. i did a copy paste and it seems the 3x/y is in a diff box and does not copy onto this screen. http://www.www.urch.com/forums/images/icons/icon9.gif pls help with the solution. Stem: 1. 3x/y is a prime number, 3x/y > 2 2. y != 3 By definition, a prime number is a +ve number that has only two factors - 1 and itself. So, some of the combinations that would work are: x=46, y=6 => 3x/y = 23 x=-51, y=-9 => 3x/y = 17 Each disproves statements I, II and III (In fact, x and y need not even be integers, they could be fractions for all the stem says) Hope that helps! Quote Link to comment Share on other sites More sharing options...
br_cspr Posted April 19, 2007 Author Share Posted April 19, 2007 thnx pal. it helps Quote Link to comment Share on other sites More sharing options...
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