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ds 500 test 7 #23

This topic has 2 member replies
dunkin77 Master | Next Rank: 500 Posts Default Avatar
Joined
01 Apr 2007
Posted:
269 messages

ds 500 test 7 #23

Post Sun Apr 08, 2007 2:33 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Hi,

    The correct answer is E) but I thought the answer was D).

    So, the reason why answer has to be E) is because there are possibility that either p or q can be negative to make it zero??


    23. If x is an integer, is (x + p)(x + q) an even integer?
    (1) q is an even integer.
    (2) p is an even integer.

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    Post Sun Apr 08, 2007 5:16 pm
    Often on DS picking #'s can help you make sense of the statements. On DS questions that ask you a yes/no question, you have to remember that the statment is only sufficient if it gives you always yes or always no, not both.

    For statment 1, let's say x=2, q=2, and p=2.
    that gives us (2+2)(2+2)=4*4=16.

    But we could also say that q=2, p=2 and x=1.
    That gives us (1+2)(1+2)=3*3=9.

    So the statement is insuffiecient because the product could be either even or odd.

    The same numbers can be used for statement 2, so it's insufficient as well.

    And since we can use the same in both statmetns, then together they don't tell us anything new. E is the answer.

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    Cybermusings Legendary Member Default Avatar
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    Post Thu Apr 12, 2007 8:55 am
    23. If x is an integer, is (x + p)(x + q) an even integer?
    (1) q is an even integer.
    (2) p is an even integer.

    Even*Odd = Even
    Even*Even = Even
    Odd*Odd = Odd
    Odd + Even = Odd
    Even+Even = Even
    Odd + Odd = Even

    Keeping these in mind Statement I alone is insufficient ans so is Statement II

    If put together even then they are not sufficient. Hence E

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