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hmm lets see if we see any prime..ahh well to many numbers so cant see primes...

OK that is not working..so lets see unit digits...no perfect square has a unit digit of 7..so A is out...hmm 6...well 6*6=36..well OK, I will keep B...now look at C...hm any unit digit of with 0...well this one if it is a peferct will have to have a 10th digit which is 0...so C is out....oK D looks Ok...so lets see is B, D or E...well lets say Gmat wants us to do some math...so E is out...down to B and D....

OK I see a pattern in B...this looks like it could be a perfect square..so B it is...withouth doing any math...just when I am tired from a days work...logic baby...

using similar logic as in the previous post I would say B. A is out definitely, C as well. E is out too. Is there a shortcut here that I am missing, is there another way to solve quicker than just looking at the unit digit and then tens, hundreds... its so late , sleeeepy time. kayzer is out..

qsr is determined to make us crazy with calculations

GSR - if you don't cut it out with these sadistic number properties questions, I'm going to create a really crazy "work" rate problem that'll make you go catatonic and I'll post it when you're in the middle of your project tomorrow!

Titleist

even when I'm
_________________

"Wow! Brazil is big." â€”George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

qsr is determined to make us crazy with calculations

Admit that, like freshinha i came down to B D and E ...all I tried is to find ways to consider the last three digits but still stuck
GRS> you're evil this time

which of these is a perfect square? A) 2893467827688677 B) 79242972893648656 C) 9134751098236810 D) 5916378240699596 E) None of the above

Clock starts now--you got 1.5 mins...

okie, let me divulge a golden rule for checking if a number is perfect square or not!!!!
Firstly add up all the digits of the number ...if the result still contains more than two digits ...add the digits ...if the new result still contains more than two digits ...add the digits ...repeat this process until the result has one and only one digit ..if the digit is whether 1, 4, 7 or 9 ...the initial number is a perfect square!!!
Now try with 79242972893648656
first step: we got 97
2nd step: we got 16
3rd step: we got 7

OH YEAH ..It's 7 ...YEAH ....it's the answer!!!!!!!!!

which of these is a perfect square? A) 2893467827688677 B) 79242972893648656 C) 9134751098236810 D) 5916378240699596 E) None of the above

Clock starts now--you got 1.5 mins...

okie, let me divulge a golden rule for checking if a number is perfect square or not!!!! Firstly add up all the digits of the number ...if the result still contains more than two digits ...add the digits ...if the new result still contains more than two digits ...add the digits ...repeat this process until the result has one and only one digit ..if the digit is whether 1, 4, 7 or 9 ...the initial number is a perfect square!!! Now try with 79242972893648656 first step: we got 97 2nd step: we got 16 3rd step: we got 7

OH YEAH ..It's 7 ...YEAH ....it's the answer!!!!!!!!!

jesus, that's brilliant....
how can the question makers assume anyone human knows this shortcut?
why do you know it??? but great tip anyways!

which of these is a perfect square? A) 2893467827688677 B) 79242972893648656 C) 9134751098236810 D) 5916378240699596 E) None of the above

Clock starts now--you got 1.5 mins...

okie, let me divulge a golden rule for checking if a number is perfect square or not!!!! Firstly add up all the digits of the number ...if the result still contains more than two digits ...add the digits ...if the new result still contains more than two digits ...add the digits ...repeat this process until the result has one and only one digit ..if the digit is whether 1, 4, 7 or 9 ...the initial number is a perfect square!!! Now try with 79242972893648656 first step: we got 97 2nd step: we got 16 3rd step: we got 7

OH YEAH ..It's 7 ...YEAH ....it's the answer!!!!!!!!!

jesus, that's brilliant.... how can the question makers assume anyone human knows this shortcut? why do you know it??? but great tip anyways!

They don't only if the test maker's name is GSR.
_________________

"Wow! Brazil is big." â€”George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

okie, let me divulge a golden rule for checking if a number is perfect square or not!!!! Firstly add up all the digits of the number ...if the result still contains more than two digits ...add the digits ...if the new result still contains more than two digits ...add the digits ...repeat this process until the result has one and only one digit ..if the digit is whether 1, 4, 7 or 9 ...the initial number is a perfect square!!! Now try with 79242972893648656 first step: we got 97 2nd step: we got 16 3rd step: we got 7

OH YEAH ..It's 7 ...YEAH ....it's the answer!!!!!!!!!