GMAT Problem Solving Discussions

[eric.segal1]

Originally Posted by paki

Where did you obtain that "kind" of exercise?
Also one answer choice is missing.

hey kindly mention the post u r referring !!
in case it was the one above........ i've added the 5th option.... i dint bother to add it earlier as i only wanted the explanation

[abchekstylo]

Originally Posted by bhavin422

no dude...there is no flaw in the reasoning.
root of a positive integer can never be negative, though square of a negative number is positive...

so root of a positive number is only positive...and root of a negative no is imaginary or complex...

and u get ans as 1 when x is 5 and -1 when x= -5
and not +/- 1 when x is 5 and -5....

sign is taken care by x in denominator..hence the answer is E....and not bcoz it can be 1 and -1 simultaneously...

I choose to disagree with you ,Bhavin.
Root of a positive number CAN be positive or negative and it is so downright obvious that i don't see the point in arguing over it anymore.Why are you not getting it?Isn't root of 25 = +5 or -5?

[himanshu_ahuja]

hey guys

i am himanshu..planning to appear for gmat by end of june..does anyone has a soft copy of OG 10 th edition

Regards,
H

[sillyfool]

Originally Posted by himanshu_ahuja

hey guys

i am himanshu..planning to appear for gmat by end of june..does anyone has a soft copy of OG 10 th edition

Regards,
H

Hi Himanshu
Please post material that is relevant to that thread only
By the way you can get OG from esnips.com
Hope this helps

Sillyfool

[himanshu_ahuja]

answer explaination to below question is as below

there are 7 people out of 12 who can be seated anywhere, therefore factorial 7 or 7! which is equal to 5040
there are 3 people who can sit on only 1 side, therefore total options = factorial 3 = 6
there are 2 people who can sit on the other side only, therefore total options = factorial 2 = 2

total = 7! x 3! x 2! = 60480..hope its clear!


Can Someone plz help me with this?
A group of 8 man r to b chosen from 12 men for rowing out of which 3 men can row on one side only & 2 can row on the other side only. Find the numbr of ways of arranging the crew with 4 members on each side.
40320
30240
60480
10080
20640

PS: the answer given is 60480
but can someone plz give proper explaination.

[himanshu_ahuja]

Originally Posted by sillyfool

Hi Himanshu
Please post material that is relenat to that thread only
By the way you can get OG from esnips.com
Hope this helps

Sillyfool

sorry buddy..still learning to work on this site..anyway thanks..will try on above site

[bhavin422]

Originally Posted by abchekstylo

I choose to disagree with you ,Bhavin.
Root of a positive number CAN be positive or negative and it is so downright obvious that i don't see the point in arguing over it anymore.Why are you not getting it?Isn't root of 25 = +5 or -5?

it is very obvious to me as well...root 25 cannot be -5...its not about argument...it is about clearing the concept...i would be glad if seniors could clarify this...it would be gud if somebody can clear this ambiguity...

[sillyfool]

Originally Posted by bhavin422

it is very obvious to me as well...root 25 cannot be -5...its not about argument...it is about clearing the concept...i would be glad if seniors could clarify this...it would be gud if somebody can clear this ambiguity...

i dont know whether you guys will consider me senior or not
But still i will try to explain
If we take square of 5 it is 25
and for -5 it is also 25
So when we take suare root of a no. we generally put +/- sign before it
Like in quadratic equation remember the roots formula for roots
they also consider both the +ve and -ve value for D that is b^2 - 4ac
hope this clears the confusion

Sillyfool
and yes there are no stupid questions and arguments so keep discussing as
long as you ppl dont start fighting

[sillyfool]

Originally Posted by himanshu_ahuja

answer explaination to below question is as below

there are 7 people out of 12 who can be seated anywhere, therefore factorial 7 or 7! which is equal to 5040
there are 3 people who can sit on only 1 side, therefore total options = factorial 3 = 6
there are 2 people who can sit on the other side only, therefore total options = factorial 2 = 2

total = 7! x 3! x 2! = 60480..hope its clear!


Can Someone plz help me with this?
A group of 8 man r to b chosen from 12 men for rowing out of which 3 men can row on one side only & 2 can row on the other side only. Find the numbr of ways of arranging the crew with 4 members on each side.
40320
30240
60480
10080
20640

PS: the answer given is 60480
but can someone plz give proper explaination.

yaar the answer is right but there is something fishy about the soln
I mean you have not considered that we have to select 8 ppl anywhere
but still its the right answer , well i am not saying this is wrong method or something
but i will request some1 to post another soln cause i m tryin on the same and still
not able to figure out

[bhavin422]

wrong post...