Search found 5 matches
Re: how do you solve...
(3 222)^4 / (222)^4 = 3^4 222^4 / 222^4 =vladmire wrote:(666)^4/(222)^4
3^4 = 81
- by moshum
Sun Jan 18, 2009 3:26 pm- Forum: Problem Solving
- Topic: how do you solve...
- Replies: 3
- Views: 1182
Re: (C) 2008 GMAT Club - [t]m07#16[/t]
Which expression is the greatest? 1876452 / 1876455 1883456 / 1883459 1883491 / 1883494 1883446 / 1883449 1883453 / 1883456 these expressions are equivalent to: x / (x+3) we can modify it to x/x (1/(1+3/x)) = 1/(1+3/x) the smaller the denominator, the bigger is the whole fraction (1+3/x) is minimum...
- by moshum
Fri Jan 16, 2009 7:13 pm- Forum: Problem Solving
- Topic: (C) 2008 GMAT Club - [t]m07#16[/t]
- Replies: 2
- Views: 1784
Brent, shouldn't be the straight line from (0,0) to (3,3) to separate the 2 regions?
Because the "switching" points where the y coordinate is getting bigger than the x coordinate is at (0.5,0.5) ; (1,1) ; (2,2) etc...
- by moshum
Wed Jan 14, 2009 7:31 pm- Forum: Problem Solving
- Topic: Probability - A point from region R
- Replies: 8
- Views: 2782
if all girls have the same colour, they will either have all white or all black marbles. this is only possible in 2 outcomes The total number of outcomes is 10! But since we have only 2 different elements it should be divided by 5! 5! 10! / (5! 5!) = 252 so the answer is 2/252 = 1/126 (A) ??? I am n...
- by moshum
Wed Jan 14, 2009 7:50 am- Forum: Problem Solving
- Topic: Probability - 10 marbles
- Replies: 143
- Views: 55372
if x-y=6 then (x-y)(x-y)=36
(x-y)(x-y)= x^2 - 2xy + y^2 = 36
since we know that xy = 8 it follows:
x^2 - 2(8) + y^2 = 36
so x^2 + y^2 = 52
Answer is (E)
- by moshum
Wed Jan 14, 2009 7:16 am- Forum: Problem Solving
- Topic: Algebra - xy=8 and x-y=6
- Replies: 2
- Views: 2252