<p>If X + 2P=y, and P is positive, which of the following statements could not be true?</p>
<p>a. x>y, b. x+P > -y, c. y=P, d. y+x>1, e. y>x+1</p>
<p>I would really appreciate if someone could explain how to solve this problem and why the answer isn't c. </p>
<p>Thanks</p>
<p>The answer cannot be C because it is possible that P is one.</p>
<p>Where’d you get this question from?</p>
<p>If you startwith x, and then add to it a positive number to get y, then y MUST be greater than x (in fact, 2p greater). So choice a, x>y is impossible.</p>
<p>wait so what makes c possible?</p>
<p>If x = -P, then x + 2P = -P + 2P = P</p>
<p>(And besides, once ‘a’ is the answer, if the problem is written corrrectly there can’t be another right answer!)</p>
<p>If P=1 and y=1:</p>
<p>X+2(1)=1, X=-1</p>
<p>But X must always be smaller than Y because P is positive. (In this case X is negative to satisfy P=Y.)</p>
<p>well, isn’t it a: x>y?? it can’t be true because 2p is positive, and x + 2p = y, so x has to be less than y, x can’t be greater than y</p>
<p>overachiever92, don’t forget that x can be negative</p>
<p>Thanks guys, I guess I had a bit of early morning stupidity in me…</p>
<p>X + 2P = Y, Let 2P = K, thus K is an integer</p>
<p>X + K = Y</p>
<p>X = Y (mod m)</p>
<p>Thus X<Y so answer is A.</p>