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How do you use formula to calculate these combinatorics problems?
Hello, I am So confused as I thought all combinatorics can be estimate using formulas. However I couldn't figure out how to work out the following and it makes me a bit nervous. Please could anyone...
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If x is a two-digit integer and the ratio of its units digit
If x is a two-digit integer and the ratio of its units digit to its tens digit is 2 to 1, what is the value of x ? a) The units digit of x is 4 more than its tens digit.b) The product of the two digits...
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workbook/practice questions sets downloadable
Hello All,I have been searching a lot for a recent set of quant questions along with solutions for both PS and DS practice. I have finished the basics from the MGMAT and questions from the OG13,...
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Worst Case Scenario Questions
Worst Case Scenario Questions ! This post is a part of the Special Questions Directory focusing on Quant topics traditionally neglected and not covered by conventional sources but still tested on the...
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A cubic box with an edge length of 4 inches holds a ball
A cubic box with an edge length of 4 inches holds a ball with a radius of 2 inches, such that the ball touches the box on all six sides (it is tangent to all six sides). What is the distance, in...
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Each of the positive integers a, b, and c is a three-digit integer. If
Each of the positive integers a, b, and c is a three-digit integer. If each of the digits 1 through 9 appears in one of these three integers, what is the minimum possible value of the sum of a, b, and...
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In how many different ways can the letters of the word "CORPORATION"
In how many different ways can the letters of the word "CORPORATION" be arranged in such a way that no two vowels are together?Sorry I don't have an answer to this
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If n is an integer and n^3 is divisible by 24, what is the largest num
If n is an integer and n^3 is divisible by 24, what is the largest number that must be a factor of n?(A) 1(B) 2(C) 6(D) 8(E) 12
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The volume of cylinder A is how much more than the volume of cylinder
The volume of cylinder A is how much more than the volume of cylinder B if cylinder A has x+4 radius and cylinder B has a height of 4?1) cylinder B has a volume of 62) the ratio of cylinder A's volume...
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If A, B and C are distinct digits such that the square of the two
Responding to a pm:Quote:If A, B and C are distinct digits such that the square of the two digit number AB equals the three digit number CCB, then the sum of all possible values of CCB equalsa) 555b)...
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Good to great？！48-50-51？
Hi, I tried twice GMAT and got 50 and 48 respectively, I searched some of questions in different forums only found that some of the challenge questions not really challenging to me? can somebody advise...
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P&C Question
This topic have been merged with: http://gmatclub.com/forum/topic-157417.html
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CIRCLE PROBLEM - PLEASE HELP ME UNDERSTAND THE RULE
I have attached two images. One is a problem and one is a rule. I am not able to understand why is it that I cannot apply the rule to this problem? or can I apply? I know that the radius hits the...
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Two chefs, Chef Andrew and Chef Bonnie, were hired to prepare a dinner
Two chefs, Chef Andrew and Chef Bonnie, were hired to prepare a dinner. The two chefs began working at the same time, but Chef Andrew was only able to work for 2 hours. How many hours did it take Chef...
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Right triangle DEF has angles in the ratio 1:2:3 and is inscribed in a
Right triangle DEF has angles in the ratio 1:2:3 and is inscribed in a circle with center C such that each vertex of DEF lies on the circumference of C. If the shortest side of DEF has length x, which...
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In a freshman high school class there are 125 total students. If 75 of
In a freshman high school class there are 125 total students. If 75 of the total students are enrolled in Geometry, how many students are enrolled in Biology?(1) 50 of the total students are enrolled...
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How important is Probability and P&C
The title says it all. I have read somewhere that it is not worth the pain in the neck (for people like me who always hated Prob, P&C problems in high school) effort that one puts especially when...
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An art gallery has only paintings and sculptures. Currently, 1/3
An art gallery has only paintings and sculptures. Currently, 1/3 of the pieces of art are displayed, and 1/6 of the pieces on display are sculptures. If 1/3 of the pieces not on display are paintings,...
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Series and Sequence
If a1 = 1 and an+1= 2an + 5, n = 1, 2 .. , then a100 is equal to ?a. 5*2^99-6b. 5*2^99+6c. 6*2^99+5d. 6*2^99-5e. 6*2^99-6Source: GMAT Mocks online
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If the positive integer n is greater than 6
If the positive integer n is greater than 6, what is the remainder when n is divided by 6?(1) When n is divided by 9, the remainder is 2.(2) When n is divided by 4, the remainder is 1.Kudos if you like...
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