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OG 11 DS problem

This topic has 2 member replies
pavithra Junior | Next Rank: 30 Posts Default Avatar
Joined
18 Jan 2007
Posted:
24 messages

OG 11 DS problem

Post Wed Mar 14, 2007 1:21 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    This problem is in the DS section (QN. no.146) of OG11.

    Is n an integer?

    1) n^2 is an integer
    2) sq. rt of n is an integer

    The answer given is B.

    If n^2 is an integer, n should also be an integer , right??? Shouldn't the answer be D.

    Someone please explain.

    Thanks
    Pavithra

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    rajesh_ctm Master | Next Rank: 500 Posts Default Avatar
    Joined
    27 Feb 2007
    Posted:
    135 messages
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    2 times
    Post Wed Mar 14, 2007 5:40 pm
    If n^2 is an integer, n should also be an integer , right???

    Not necessary. Fitting in numbers is the easiest method to verify. Root of 2 is not an integer. But its square, i.e. 2 is an integer.

    pavithra Junior | Next Rank: 30 Posts Default Avatar
    Joined
    18 Jan 2007
    Posted:
    24 messages
    Post Wed Mar 14, 2007 7:13 pm
    Right I get it now...Thanks

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