Barisal HS 2008_06
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Please don't post problems (by starting a topic) in the "X: Solved" forums. Those forums are only for showcasing the problems for the convenience of the users. You can always post the problems in the main Divisional Math Olympiad forum. Later we shall move that topic with proper formatting, and post in the resource section.
Please don't post problems (by starting a topic) in the "X: Solved" forums. Those forums are only for showcasing the problems for the convenience of the users. You can always post the problems in the main Divisional Math Olympiad forum. Later we shall move that topic with proper formatting, and post in the resource section.
There's 6 brown and 9 blue socks in a drawer.If you pick up two socks from it(randomly), what is the probability of picking up same coloured socks?
Am I right???
r@k€€/|/
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Mehfuj Zahir
- Posts:78
- Joined:Thu Jan 20, 2011 10:46 am
Re: Barisal HS 2008_06
If the socks are in different size i think its not necessary to count permutation for probability
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bristy1588
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Re: Barisal HS 2008_06
Yeah, You're right.
Please Install $L^AT_EX$ fonts in your PC for better looking equations,
Learn how to write equations, and don't forget to read Forum Guide and Rules.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Sherlock Holmes
Learn how to write equations, and don't forget to read Forum Guide and Rules.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Sherlock Holmes
Re: Barisal HS 2008_06
Yeah, You're right.
Please Install $L^AT_EX$ fonts in your PC for better looking equations,
Learn how to write equations, and don't forget to read Forum Guide and Rules.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Sherlock Holmes
Learn how to write equations, and don't forget to read Forum Guide and Rules.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Sherlock Holmes
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nafistiham
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Re: Barisal HS 2008_06
could some one show the solution
\[\sum_{k=0}^{n-1}e^{\frac{2 \pi i k}{n}}=0\]
Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.
Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.
Re: Barisal HS 2008_06
Probability to get a brown pair $= \frac 6 {15} \cdot \frac 5 {14} = \frac 1 7$.
Probability to get a blue pair $= \frac 9 {15} \cdot \frac 8 {14} = \frac {12} {35}$.
Add them up and we get the total probability $= \frac {17}{35}$.
Probability to get a blue pair $= \frac 9 {15} \cdot \frac 8 {14} = \frac {12} {35}$.
Add them up and we get the total probability $= \frac {17}{35}$.
Please Install $L^AT_EX$ fonts in your PC for better looking equations,
Learn how to write equations, and don't forget to read Forum Guide and Rules.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Sherlock Holmes
Learn how to write equations, and don't forget to read Forum Guide and Rules.
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Sherlock Holmes