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 Post subject: GMAT Symbols
PostPosted: Sun Jun 26, 2011 6:57 pm 
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Joined: Sun May 30, 2010 3:15 am
Posts: 424
For positive integer values of n, the operation n# is defined as the sum of all integers from 1 to n, inclusive. For example, 4# = 1 + 2 + 3 + 4 = 10.
If 15# – 14# = k#, what is the value of k#?
A. 1
B. 4
C. 5
D. 14
E. 15

(E) The symbol # is a function. These types of functions are common on the GMAT. Using the definition of n#, we know that:
15# – 14# = (1 + 2 +…+ 15) – (1 + 2 +…+ 14) = 15.
So k# must equal 15, or choice (E).
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Although 15# – 14# = 15 what the problem asks is: 15# – 14# = k#
So, k# = 15 but k = 5 because k# =1 + 2 + 3 + 4 + 5 = 15
So, the right answer should be C.
Please clarify.


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 Post subject: Re: GMAT Symbols
PostPosted: Sun Jun 26, 2011 6:59 pm 
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Joined: Sun May 30, 2010 2:23 am
Posts: 498
The question asks for the value of k#, NOT just k.
The value of k# is 15, which is the answer choice E.


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