sueka

Unfortunately I do not have the answers. Here are my solutions: 1. 3.2*10^6 = 32*10^6 2. a1 = 1/2 an = (-1)^(n+1) * (1/2)^n a100 = - 1/2^100 a104 = - 1/2^104 Answer B 3. Volume of cuboid = 9*5*3 4. a1 = 350 an = a1 - (n-1) a25 = 350 - (25-1) = 226 5. Answer C here we have to look for the worst case. since k>0 and is an integer, first and foremost we have to check for k=1. well it is divisible by 20. for all the rest it is true. 6. [8*n + 10*(n+2)] / [n+n+2] answer: (9N+10)/(N+1) 7. m/T = 1/3 m/(T-2) = 2/5 Answer: T=12 8. Answer C 9. Answer (III) only 10. 1/100 11. Answer: C 12. Answer: A 13. 1/3

a*b > 0 0 Col A: (a/b)/c Col B: a/(b/c) Is it D or A?

1. Given that 1 trillion = 10^12. How many millions is 3.2 trilion? 2. a1 = 1/2 an = -(an-1)/2 Col A: a100 Col B: a104 3. Given that the dimensions of a rectangular box are 10x6x4 units. A cuboid is placed inside the rectangular box, such that the gap between the two is covered with some material of width 1/2 unit. Find the volume of the cuboid. 4. The sales of a company decreased from 350, on the first day, to 349, on the second day, to 348, on the third day, and so on. If this continues what will be the amount of sales on the 25th day? 5. k is a positive integer Col A: Probability that k(k+1)(k+2)(k+3)(k+4) is divisible by 20 Col B: 1 6. Given that 'n' numbers are '8', i.e. (8,8,8,8,8,8....) and 'n+2' numbers are '10', then what is the average of the two sets? 7. Given that in a group of men and women, men are 1/3rd of the total. When two women leave, the men become 2/5th of the total. Find the total. 8. a1 = 1; an = (an-1+4n-1)/2 Col A: a2 Col B: 4 9. Given that 'x' is an odd integer, which of the following is odd? I. (x+81)(x+96) II. x^2 + 81 + 96 III. x^2 + 81*96 10. From the numbers 200 to 999 inclusive, what is the probability of selecting a number, which end with '03' 11. x^2 + 5x =0, and x!=0, then Col A: x+5 Col B: 0 12. http://i55.tinypic.com/b4e2xe.jpg If x>135o Col A: a/b Col B: 1 13. http://i56.tinypic.com/eretmv.jpg Find the slope of segment AB?

STANZA-LINE==concert-program from the list of frequent analogies

there is something wrong here: 1/11 > 1/12 I think this is from Raju, but are you sure this is the right definition of the problem?

yeah, guys you are right. I just solved it exactly as mk2009. Answer is D

no OA. In my opinion it is A. Anyone else?

|x-2| > y Col A: |x| Col B: y

What is the probability that the product of two integers (not necessarily different integers) randomly selected from the numbers 1 through 20, inclusive, is odd? a) 0 b) 1/4 c) 1/2 d) 2/3 e) 3/4

I agree that the solution is 1/4C2 = 2/4 * 1/3 = 1/6 DWarrior You are for the first pick, there are 2 out of possible 4 outcomes for the first number. When you replace back though, the second draw would have a probability 1/4. Say at first you pick 6. You replace it back. Then the probability of picking 2 is 1/4, because you placed back the 6 into the set, and it is still available for drawing. the favorable outcome is just 1 because only 2 can be the other number. So when "drawing with replacement", the probability is 1/8. Bu then again, this is not what the question refers to.

ah -23, right. on your question, I am not so sure. I could not find anything on that matter in the info docs of GRE. I would say that negative numbers should be included. any other opinion ?

Simply put, the volume of the material needed for every pipe is a calculated by subtracting the inner hollow volume of the pipe from the outer volume of the pipe. In our case both volumes are cylindrical. Inner volume -> 70 * ( 33/2 )^2 Outer volume -> 70 * ( (33+2*2)/2 )^2 Outer - Inner = 280 * 17.5 * pi P.S. (33+2*2) is the diameter of the outer volume = diameter of the hollow volume + 2*thickness

Q1 Rate(a) = 1/x Rate(b) = 1/2x Rate(a&b) = 1/x + 1/2x = 3/2x Time(a&b to finish the job) = 1 / (3/2x) = 2x/3 ColA 2x/3 = 8x/12 ColB 3x/4 = 9x/12 Answer ColB Q2 (the easy way) v -> the amount of vinegar v/12 = 0.4 Therefore v=4.8 oz You want to add oil so that v is only 25% of the final solution, so: v/(12+x) = 0.25 4.8 = 3 + 0.25x x=7.2 Q3 At first I eliminated answers A and C, since they are under 1. Then you simply add the other 3 pairs and find out which is less than 1. Luckily, you only have to add 2 pairs (B,D) and they turn out to be less than 1. Q4 Number of ways of selecting 1 even number - 5C1 Number of ways of selecting 1 odd number - 5C1 Number of ways of selecting a pair of numbers, in which one is even and one is odd = 5C1 * 5C1 = 25

The X=1 is quite tricky. Thanks DWarrior One more thing though - X=-25 is also a possible solution so yes, D is the answer

when it comes to arranging I would definitely use common denominator. It's not the fastest way, but the probability of making a mistake when arranging 5 ratios is substantial. plus, it's just 5 ratios so 1min 30 sec should be more than enough (unless you do not have ratios like 1234234/89709789, :-) ).