Forum: GMAT Math

Hi all, Thanks for taking the time to view this querry. Needless to say, I'm the baby (a bit overgrown maybe) in the block and would be highly obliged if you could suggest some problem solving math books. While I found Kaplan's advanced prep for advanced students helpful, its very limited in...

If anyone's aware of a quick formula that gives the sum of 'n' consequtive numbers starting from 'r', please let me know! Like sum of 'n' consequtive numbers starting from 6. Like the sum of first 'n' consequtive numbers = n (n+1)/2 I cannot recall , but there is one for sum of squares/cubes...

If x dollars is invested at 10 percent for one year and y dollars is invested at 8 percent for one year, the annual income from the 10 percent investment will exceed the annual income from the 8 percent investment by $56. If $2000 is the total amount invested, how much is invested at 8 percent? ...

The tenths digit of a certain number is 3 times more than hundredths digits, which of the following CANNOT be the number 0.105, 0.722, 0.841, 0.923 ? -------------------------------- any thoughts?

Does G(x)=ax^2+bx+c have 2 intersections with axis-x? 1) G(x)-4 has 2 intersections with axis-x 2) G(x-4) has 2 intersections with axis-x

If the coin is tossed 5 times, what is the probability that no more than 3 out of 5 times it will show heads? My Approach: Probability for no heads = 1/32 = 1/32 Probability for 1 head = 5/32 = 5/32 Probability for 2 head = 5C2/32 = 10/32 Probability for 3 head =...

Below are some questions that came up on a Kaplan CAT. Unless I have installed the Kap software incorrectly, none of the CATs provide answers and solutions. I assume the questions below are fairly simple but since I have never seen the correct answers I would appreciate some answers and solutions....

Ann, Bob, Chris, Dana, and Eric are different ages such that their average age is 16. Bob is twice as old as Ann was three years ago. Eric is nine years younger than Bob. The sum of Chris and Ann's ages is equal to twice Dana's age. Dana is one year older than Ann. How old is Eric? A) 13 ...

I realized that I am very weak in GMAT graph related questions. Can anyone point out to me where can I get materials to help me with the problem? Thanks.

While solving a math problem, this convention question came up. For an integer, is the first digit the units digit or the most significant digit? So for example if ETS gave us a 3 digit number, is the units digit the first digit or is the hunderds digit the first digit?

Pls help me solve this. In a high school debating team consisting of 2 freshmen, 2 sophomores, 2 juniors, and 2 seniors, two students are selected to represent the school at the state debating championship. The rules stipulate that the representatives must be from different grades, but...

P&C : http://www.ping.be/~ping1339/Pcount.htm More math http://www.ping.be/~ping1339/mathindex.htm Cheers....

If r does not equal to zero, and r* is defined as 1/r-1, what is the value of: -(r*) + (r-1)* A. 1/r^2 - r B. r^2 + r -1/r^2 - r C. 2r^2 + 2r +1/r-r^2

Is it just me or is the following Kaplan PS question poorly worded?: The length of each side of square A is increased by 100 percent to make square B. If the length of the side of square B is increased by 50 percent to make square C, by what percent is the area of square C greater than the sum...

What math questions are more likely to appear- Eg- geometry, standard dev etc?

Question number 16 on page 364: If a, b, and c are distinct nonzero numbers, is (a+b)^2 * (b-c) / (a-b)^3 * (b-c)^3 >= 0 ? (1) a>b (2) b>c

How many way can the letters of the word MISSISIPPI be arranged? A. 11260 B. 12000 C. 12600 D. 14800

Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the other’s point of departure. The two trains passed each other after traveling for 2...

In the decimal representation of x, where 0 < x < 1, is the tenths digit if x nonzero? (1) 16x is an integer. (2) 8x is an integer.

If a sequence X1,X2 .. is such that X1=3 and Xn+1= 2*Xn-1 forx=1 than what will be the value of X20-X19?