Recent content by greprep

Awesome! So the answer here would just then just be (10)(9)(8)(7)(6)(5)(4), or 604,800.

Of course, thanks for your help. I'm thinking that I would look for the max and min. Meaning, the maximum number of cars that have A or B are if there is no overlap, meaning 82 + 73. And the minimum, is if there is full overlap (excluding the fact that 8 have B and C), and we know that we...

Oh, I see. So I would put in 5 first for the potential odd number (1,3,5,7,9), then 5 at the end for the potential even numbers (0,2,4,6,8), and that leaves us with 10-2 (8) choices for the second, 7 for the third, 6 for the 4th, etc?

Would it then just be 5x4x3, according to the fundamental counting principal?

Can someone guide me through the process of solving the following? Many thanks. "Given the set {11, 12, 13, 14, 15}, by approximately how much does the standard deviation change if the least value is decreased by 2 and the greatest value is increased by 2?" These questions are all over the...

Hi, All. I'm trying to re-familiarize myself with standard deviations. Any resources? I'm reading through the threads here and trying to figure out the following: "n is a positive integer. What is the standard deviation of 10 consecutive positive multiples of n. And what is the standard...

Hi All, I'm studying for the GRE, and really struggling with combination questions for some reason. I'm posting here quite a bit, but just wanted to say thank you so much for your help. What would be the fastest way to solve the following? "At Deb's Deli, a customer may choose either a...

"Jacob needs to create a 6-digit code for his bank account using the digits from 0 to 9. He wants the first digit to be odd and the last digit to be even. If he does not repeat any digits, how many different 6-digit codes could Jacob create?" Would the best way to solve this be: (5)(9)(8)(7)(6)(4)?

Hi, All! Prepping for the GRE here and definitely notice a weakness in calculating potential combination questions. Any advice on how to solve the following type of problem quickly? "An automotive manufacturer installed part A into 82 cars, part B into 73 cars, and part C into 25 cars. At...

Thank you so much. Would I use the same method for this problem: "how many different committees of 7 people can be formed from a group of 10 people?"

Hello! What is the fastest way to solve the following (I'm prepping for GRE and going too slow right now):"An appliances model number has three alphanumeric characters. The first character must be one of 24 permissible letters in the alphabet. The next character is numeric, a digit from 1 to 9...