If # represents one of the following operations +,-, and *, : DS Archive
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# If # represents one of the following operations +,-, and *,

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If # represents one of the following operations +,-, and *, [#permalink]

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20 Feb 2005, 08:33
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If # represents one of the following operations +,-, and *,
is k#(l+m) = (k#l) + (k#m) for all numbers k, l, and m.

(1) k#1 is not equal to 1#k for some number k.
(2) # represents substraction.
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20 Feb 2005, 09:29
Thanks!!!!!!

I got confused with this one as I forgot that 'NO' can be a valid ans.
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21 Feb 2005, 13:11
The answer is D because...

The only way that k#(l+m) = k#l + k#m is if of the operations listed '#' = *

From A: If k#1 does not equal 1#k that means that it is not multiplication therefore you get the answer that k#(l+m) does not equal k#l + k#m

From B: you get the same thing
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"No! Try not. Do. Or do not. There is no try.

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23 Feb 2005, 11:40
The answer is D.
Substitute each sign into the question and verify, you would conclude with D
23 Feb 2005, 11:40
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# If # represents one of the following operations +,-, and *,

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