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November 11th, 2009, 09:56 AM
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The Keeper of Grounds
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Join Date: Oct 2006
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Q50. GMAT PS - Permutations
Q. A three letter code with different digits is to be selected from the first 20 letters of the alphabet. How many ways can the code be selected?
A) 6842
B) 7504
C) 7568
D) 6840
E) None of these
PLEASE PROVIDE YOUR REASONING AND NOT JUST THE ANSWER CHOICES.
Difficulty Level : Easy
Time to Solve : <70 secs
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November 11th, 2009, 10:47 AM
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Buckaneer
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Join Date: Apr 2009
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20*19*18=D. And, Hagrid, why are your crash courses valid until the date which has already passed?
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November 11th, 2009, 10:58 AM
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The Keeper of Grounds
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Join Date: Oct 2006
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Quote:
Originally Posted by clerk
why are your crash courses valid until the date which has already passed?
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Only the offer has expired, the crash courses are still valid  If you want to look at the available batches check here : GMAT Crash Courses
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November 12th, 2009, 12:48 AM
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New Crew Member
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Join Date: Nov 2009
Location: Bangladesh
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its easy: D. quick guess will work here.
20*19*18 = ?
last digit must be zero. Ans is D/E.
just multiplied 19*18 and doubled it with a zero after it !!
__________________
Nurul Hai
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November 12th, 2009, 10:00 AM
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Spell Caster
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D - 20 secs. I had the same reasoning as the two listed above.
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