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25 Apr 2013, 19:51
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My daughter had the following question on her ACT test and wanted me to explain it but had no clue
A#B and A - B=0
And idea what it means? Thanks for any and all information.
A#B and A - B=0
And idea what it means? Thanks for any and all information.
25 Apr 2013, 20:38
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4littlepigsmom
Hi 4littlepigsmom... I'm not sure you'll get exactly what you're looking for in this forum. Pardon my confusion, but what exactly is an ACT test? (is it the American College Testing?)
In general, # can mean many things. In mathematics, it's often shorthand for the cardinality of a given set, i.e. the number of elements of that set. Note that this concept isn't tested on the GMAT in any way, so let me try and surmise a solution based on the information provided.
If the two statements you indicated comprise the entirety of the problem given, this may imply that the cardinality of the set is equal to the element(s) within it. This would in turn imply that there is only one element in the set, because the cardinality is a single number and thus there is only one entry. This would mean that the set is {1} and the cardinality of the set is 1, which is why 1-1=0. While this doesn't make total sense to me, it's my best guess without any further information.
The only guess I have is that #B is trending on twitter... #wrongforum
Best of luck!
-Ron
26 Apr 2013, 02:41
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The # symbol is often used to denote the \(\neq\) symbol
But I do not know how A-B can be 0 if A is not equal to B.
If you could post the entire question things would be more clear.
BTW : I guess ACT is an alternative to the SAT?
But I do not know how A-B can be 0 if A is not equal to B.
If you could post the entire question things would be more clear.
BTW : I guess ACT is an alternative to the SAT?
