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each pile will have at most two beans one each from yellow and green in order to maximize the red beans in any pile. so that way we have only 5 slots left
so max # of red beans will be 5

by thephoenix

Tue Jul 05, 2011 7:53 am
Forum: Problem Solving
Topic: Red Beans
Replies: 4
Views: 1627

a better way is to do by POE
eqn A^2/B
new eqn A^2/2B
in order to get original the numerator has to be inc so A,B,C eliminated
E 50% inc---->means 2.25*A^2/2B rounding of one digit gives us 2.3/2=1.15
D 40% inc----> means 1.96A^2/2B rounding of one digit gives us 2/2=1
hence d is closest

by thephoenix

Sun Jun 19, 2011 10:27 am
Forum: Problem Solving
Topic: Rate of change
Replies: 5
Views: 1725

magicalhat wrote:how important are these topics for someone aiming for a 650 - 700? i've heard that they don't appear that much, but i really don't know... what has been the experience of the gmat experts?
my friend whatever u have heard is all wrong , these are very important topics if u are aiming for 650-700

by thephoenix

Sat Jun 18, 2011 10:10 am
Forum: GMAT Math
Topic: combinatorics and probability
Replies: 2
Views: 1844

the best way to solve these type is to use some value satisfying the conditions
here n can be 2,10,14,22....
now insert few value and u will get answer
like if n is 2 the the number will 8*10*12 (smallest possible number) and this number is div by 24,32 and 96
so st away go for E

by thephoenix

Fri Jun 17, 2011 5:36 am
Forum: Problem Solving
Topic: Divisibility revisited!!
Replies: 5
Views: 1549

since the set is inc by same constant the S.D will remain same.

by thephoenix

Fri Jun 17, 2011 5:27 am
Forum: Problem Solving
Topic: Standard Deviation?
Replies: 3
Views: 1176

eqn will be
X+2Y+3z=1.5*(X+Y+Z)

solving X=y+3z

by thephoenix

Fri Jun 17, 2011 5:23 am
Forum: Problem Solving
Topic: What is x in terms of y and z?
Replies: 6
Views: 1248

the easiest way is to solve in a laymen's method
for 1st person we have 3 choices so in 3 ways
for second we have 2
for last there is only one

tot ways 3*2*1=6

by thephoenix

Thu Jun 16, 2011 7:39 pm
Forum: Problem Solving
Topic: one more before going to bed...permutation?
Replies: 3
Views: 2379

Bens4vcobra wrote:Thanks all.

What does the "C2" mean? I've never seen this before...
C stands for combination
P stands for permutation

nCr means n!/(r!*(n-r)!)
4C2=4!(2!*(4-2)!)=4!/(2!*2!)

similarly
npr n!/(n-r)!

by thephoenix

Thu Jun 16, 2011 7:30 am
Forum: Problem Solving
Topic: Combinatorics - How many combinations out of two groups?
Replies: 6
Views: 15497

IMO A (B) Europeans have long known quail eating is sometimes able to make ---> use of able to is wrong, moreover in GMAT, able to almost always wrong, generally CAN is used instead of ABLE TO (C) Eating quail has long been known to Europeans to sometimes make --->Eating quail SINGULAR make PLURAL ...

by thephoenix

Mon Mar 28, 2011 8:49 am
Forum: Sentence Correction
Topic: Europeans have long known that eating
Replies: 20
Views: 6421

HSPA wrote:Hello phonix,

is the verb " makes " going on to which subject eater or Europeons??
in this s/c the verb makes agrees to the subject eating( a gerund) a gerund will always have singular verb

by thephoenix

Mon Mar 28, 2011 8:46 am
Forum: Sentence Correction
Topic: Europeans have long known that eating
Replies: 20
Views: 6421

Europeans have long known that eating quail sometimes makes the eater ill, but only recently has it been established that the illness is caused by a toxin present in the quail’s body only under certain conditions. (A) Europeans have long known that eating quail sometimes makes (B) Europeans have ...

by thephoenix

Mon Mar 28, 2011 8:19 am
Forum: Sentence Correction
Topic: Europeans have long known that eating
Replies: 20
Views: 6421

when struck b/n two correct idioms go for shorter one
c) its wordier to say unable to be distinguished, indistinguishable is better
a) correct idiom so(adj) as ...

by thephoenix

Fri Oct 22, 2010 7:58 am
Forum: Sentence Correction
Topic: so as to be and so that 1000 SC
Replies: 4
Views: 1359

@ gmat_perfect
E violates the idiom if ..then construction
if(past)......then(wud or wud have) is correct idiom
but any way thanks for highlightening the diff

by thephoenix

Sun Oct 17, 2010 1:19 am
Forum: Sentence Correction
Topic: If Vs When
Replies: 8
Views: 5203

IMO D
the stimulus is trying to make a connection b/n lead deposits in soil and elevated lead levels in children
option D confirms that when children exposed to soil have that effect otherwise no effect

by thephoenix

Sun Oct 10, 2010 6:26 pm
Forum: Critical Reasoning
Topic: CR
Replies: 4
Views: 3709

it has been posted no.f times search u will get a link

by thephoenix

Sun Oct 10, 2010 7:12 am
Forum: Problem Solving
Topic: Geometry: Dont take it for granted
Replies: 9
Views: 1736