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500 DS tricky

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

500 DS tricky

Post Mon Apr 02, 2007 2:30 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Hi,

    I thought the answer is E) but the correct answer is B).

    i) says if there is 2, there should be -2 in S; however, ii) says a and b (differrent number) can be multiplied "ab" but it dose not say same number a and -a can be multiplied..... I am confused.. Crying or Very sad

    . S is a set of integers such that
    i) if a is in S, then -a is in S, and
    ii) if each of a and b is in S, then ab is in S.
    Is -4 in S?
    (1) 1 is in S.
    (2) 2 is in S.

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    ajith Legendary Member
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    Post Mon Apr 02, 2007 5:39 pm
    dunkin77 wrote:
    Hi,
    ii) says a and b (differrent number) can be multiplied "ab" but it dose not say same number a and -a can be multiplied..... I am confused.. Crying or Very sad
    who said a and -a are not different numbers ???
    It is quite different.

    If it were same, could you please lend as much as you can, and later on I will say lending and borrowing are the same.

    _________________
    Always borrow money from a pessimist, he doesn't expect to be paid back.

    dunkin77 Master | Next Rank: 500 Posts Default Avatar
    Joined
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    Posted:
    269 messages
    Post Mon Apr 02, 2007 7:33 pm
    Okie - a and -a is different number then! Wink

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