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February 14th, 2008, 8:01 pm
Forum: General Forum
Topic: Electricity Power trading and marketering questions
Replies: 6
Views: 60370

### Electricity Power trading and marketering questions

Thanks a lot for the info guys --What is a good journal that the traders read?What is a good journal that the risk managers read?Thanks again
February 13th, 2008, 5:42 pm
Forum: General Forum
Topic: Electricity Power trading and marketering questions
Replies: 6
Views: 60370

### Electricity Power trading and marketering questions

OK if you can answer questions C and D, it'd be a starter.Also, what is a good book on power? I have a few books here (some mathematical, some not) but aint sure which one to read delve into -- I would be interested in knowing how power in traded.Thanks!
February 13th, 2008, 3:10 pm
Forum: General Forum
Topic: Electricity Power trading and marketering questions
Replies: 6
Views: 60370

### Electricity Power trading and marketering questions

<r>Hi,I am getting acquainted with the power business that banks and other firms have been investing in heavily and have a few questions. If anybody would be kind enough to answer them:A. What is the meaning of "physical trading" of power? Who are the counterparties and how do the traders get in tou...
January 28th, 2008, 10:07 pm
Forum: Brainteaser Forum
Topic: Weights
Replies: 9
Views: 61864

### Weights

Traden, I tried this on the Brooklyn Bridge and it works, OK??! Case closed.
January 28th, 2008, 7:39 pm
Forum: Brainteaser Forum
Topic: Weights
Replies: 9
Views: 61864

### Weights

that's right.
January 28th, 2008, 4:39 pm
Forum: Brainteaser Forum
Topic: Weights
Replies: 9
Views: 61864

### Weights

A woman with 2 balls of weight 10 each has to cross a bridge that is 100 feet long. She weighs 100.The bridge is old and breaks at weight > 115. How will she cross the bridge if she can cross it only once?
January 16th, 2008, 12:53 pm
Forum: Brainteaser Forum
Topic: Remove stones
Replies: 2
Views: 61542

### Remove stones

There might be something you need to add to your puzle statement. Because we have infinite primes, 2,3,5,7,11,...For every n of form prime-1 = 1,2,4,6,10, ..., Alice takes all of the stones on her first turn itself (because they are prime -1) and wins.
January 14th, 2008, 9:32 pm
Forum: Brainteaser Forum
Topic: n-gon question
Replies: 3
Views: 62372

### n-gon question

<t>For even: Only look at the diagonals 2nd in sizeFor odd: Only look at largest diags.Next you realise that smaller diagonals cannot cut this piece. By symmetry it's a small n-gon... too tired to calc the area.So for 8-gon, draw from 0 to 3, 3 to 6, 6 to 1, 1 to 4, 4 to 7, 7 to 2, 2 to 5, 5 to 0.Gi...
January 11th, 2008, 1:10 pm
Forum: Brainteaser Forum
Topic: A question from Goldman Sachs interview
Replies: 11
Views: 68171

### A question from Goldman Sachs interview

I think the OP meant a BM not a GBM.
January 10th, 2008, 4:56 pm
Forum: Brainteaser Forum
Topic: A question from Goldman Sachs interview
Replies: 11
Views: 68171

### A question from Goldman Sachs interview

Why only BM? Not 100% sure, but as long as the differences in prices are symmetrically distributed around 0 and independant, there will be reflection.
January 2nd, 2008, 6:22 pm
Topic: Any suggestions on maintaining a paper-trading book?
Replies: 1
Views: 60973

### Any suggestions on maintaining a paper-trading book?

<t>Maintaining a paper-trading bookHi,I have a few trades that I follow on a daily basis. Is there an optimal fashion in which I can understand how the trade is performing?For instance I am long the 10s/2s swap spread starting Jan 2 2008 and want to see how the trade performs on daily basis.How woul...
December 28th, 2007, 4:03 pm
Forum: Brainteaser Forum
Topic: Marble Game
Replies: 11
Views: 63916

### Marble Game

LOL
December 28th, 2007, 3:34 pm
Forum: Brainteaser Forum
Topic: Marble Game
Replies: 11
Views: 63916

### Marble Game

<t>If A and B act simulataneously --Prob(A shows Red): pProb(B shows Red): q Then the expected value for A :8pq - 3p -3q + 1On differentiating This has maxima at p = q = 3/8Giving the exp for A to be -1/8. And +1/8 to be B.----------------------------------EDIT: My question is on reaction time. Assu...
December 26th, 2007, 1:13 pm
Forum: Brainteaser Forum
Topic: White, Black, 1, 0
Replies: 7
Views: 63467

### White, Black, 1, 0

<t>Yes the problem is for 2*(2n+1) X 2*(2m+1) board, from Titu Andrescu's book but he gives a somewhat complicated proof.Also by re-arranging a chessboard I mean --1. rotate it so that white is at topmost left.2. Now take all the odd-numbered vertical strips and move them to the left. THe sum condit...
December 24th, 2007, 6:24 pm
Forum: Brainteaser Forum
Topic: White, Black, 1, 0
Replies: 7
Views: 63467

### White, Black, 1, 0

<t>Wow. Does this work for 1000X1000 matrix also? In my mind, you can rearrange the strips to get the re-arranged board:W1 B1B2 W2each of the four sub-matrices is 999 X 1001 (W means all whites, B all blacks). And the column and row rule still holds.Now taking mod 2,Sum(W1) + Sum(B1) = 1 (sum of 999...
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