500 DS tricky
500 DS tricky
Mon Apr 02, 2007 3:30 pm
Mon Apr 02, 2007 3:30 pm
QuoteHi,
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..
. 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.
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..
. 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
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Mon Apr 02, 2007 6:39 pm
dunkin77 wrote:
who said a and -a are not different numbers ???
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..
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..
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.
Mon Apr 02, 2007 8:33 pm
Okie - a and -a is different number then! 
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