Hello Brent, In this formula : Weighted average = (group A proportion)(group A average) + (group B proportion)(group B average) + (group C proportion)(group C average) + ... How do we decide which quantity is proportion and which quantity is average. I had really tough time figuring out whether aver...

Coloured Marble -- Combination

Q. In how many ways you can distribute 5 different coloured marbles in 3 distinct baskets such that each basket has at least one marble.

a. 64
b. 150
c. 175
d. 200
e. 210

OA:
B

Try its variant here :
http://www.beatthegmat.com/marbles-comb ... tml#708412

Hi Mist, I'd like to jump in and mention that I recently wrote an article on this topic: http://www.beatthegmat.com/mba/2013/09/27/does-order-matter-combinations-and-non-combinations-part-iii This article is part III in a 3-part series examining counting techniques. Here are parts I and II as well:...

Hi Brent, I am not sure how to put my doubt in words, but I hope you will get a faint idea of what I am talking about and help me, and alike, out in understanding the concept. 1. Some times when we say order doesn't matter, we divide the the factorial : - eg: picking 2 members from a group of 5 (A,...

The strategy employed in my post above can also be used to evaluate statement 1 in OG DS92: Joanna bought only $0.15 stamps and $0.29 stamps. How many $0.15 stamps did she buy ? (1) She bought $4.40 worth of stamps. (2) She bought an equal number of $0.15 stamps and $0.29 stamps. Let $F = the total...

Weaken CR - Airline question

Some airlines allegedly reduce fares on certain routes to a level at which they lose money, in order to drive competitors off those routes. However, this method of eliminating competition cannot be profitable in the long run. Once an airline sucessfully implements this method, any attempt to recoup ...