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anonymousegmat
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for any integer n greater than one /n = the product of all 30 Jun 2007, 19:38
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for any integer n greater than one /n = the product of all integers from 1 to n inclusive. how many primes are between /6 +2 and /6 +6 inclusive?











SPOILER:

So we have 720-726 inclusive. it was easy enough to narrow it down to just 723 and 727.... but i just guessed the answer was two because it was taking a while. what is a surefire way to try and figure out if a larger number is prime?? i was able to use the divisibilty shortcuts (divisible by three if the sum of digits is divisible by three etc...) but they only took me up to 11.



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sumande
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for any integer n greater than one /n = the product of all 30 Jun 2007, 21:57
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anonymousegmat
for any integer n greater than one /n = the product of all integers from 1 to n inclusive. how many primes are between /6 +2 and /6 +6 inclusive?

SPOILER:

So we have 720-726 inclusive. it was easy enough to narrow it down to just 723 and 727.... but i just guessed the answer was two because it was taking a while. what is a surefire way to try and figure out if a larger number is prime?? i was able to use the divisibilty shortcuts (divisible by three if the sum of digits is divisible by three etc...) but they only took me up to 11.
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Shouldn't the range [/6+2 to /6+6] be 722 to 726?? In which case there are no primes in that range.
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anonymousegmat
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for any integer n greater than one /n = the product of all 01 Jul 2007, 22:44
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sumande
anonymousegmat
for any integer n greater than one /n = the product of all integers from 1 to n inclusive. how many primes are between /6 +2 and /6 +6 inclusive?

SPOILER:

So we have 720-726 inclusive. it was easy enough to narrow it down to just 723 and 727.... but i just guessed the answer was two because it was taking a while. what is a surefire way to try and figure out if a larger number is prime?? i was able to use the divisibilty shortcuts (divisible by three if the sum of digits is divisible by three etc...) but they only took me up to 11.

Shouldn't the range [/6+2 to /6+6] be 722 to 726?? In which case there are no primes in that range.
Show more


sorry i was looking at my notes wrong. i dont know what the hell i did wrong... this is why you dont do GMAT at 2AM lol.



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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!