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 Post subject: GMAT SymbolsPosted: Mon Jun 24, 2013 11:19 am

Joined: Sun May 30, 2010 3:15 am
Posts: 424
If k is a positive integer, then k@ is defined as the product of all the fractions of the form 1/S, where S is a positive integer not greater than k. What is the value of 5@/4@?

A. 1/5
B. 4/5
C. 1
D. 5/4
E. 5

(A) Since k@ is defined as the product of all fractions 1/S, where S ranges from 1 to k, inclusive,
5@ = (1/1) × (1/2) × (1/3) × (1/4) × (1/5)
4@ = (1/1) × (1/2) × (1/3) × (1/4)

5@/4@ =
(1/1) × (1/2) × (1/3) × (1/4) × (1/5)
(1/1) × (1/2) × (1/3) × (1/4)

All of the fractions cancel out except for the 1/5, so the correct answer is choice (A).
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Can we understand "A is the product of X & Y" as "A = X × Y", not that A is some other combination forms of X and Y?

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 Post subject: Re: GMAT SymbolsPosted: Mon Jun 24, 2013 11:25 am

Joined: Sun May 30, 2010 2:23 am
Posts: 498
Quote:
Can we understand "A is the product of X & Y" as "A = X × Y", not that A is some other combination forms of X and Y?
"A is the product of X & Y" means exactly A = X × Y .

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