Recent content by Ahmed Abdullah

  1. Ahmed Abdullah

    Insect that has evolved to recognize carnivorous plants

    Obviously in a biome consisting of high density of carnivorous plants any insect that can recognize these plants or at least recognize organs associated with carnivory will get fitness advantage. So it seems a very natural thing to evolve from insects point of view. Has it happenned? If yes...
  2. Ahmed Abdullah

    Medical A minibus run over 4 year old and he survives How? [Warning -- Disturbing Video]

    http://www.dailymail.co.uk/news/peoplesdaily/article-3493639/Four-year-old-boy-miraculously-survives-run-minibus-China.html
  3. Ahmed Abdullah

    Why topology on a set is defined the way it is?

    Following is from Wolfram Mathworld "A topological space, also called an abstract topological space, is a set X together with a collection of open subsets T that satisfies the four conditions: The empty set is in T.X is in T.The intersection of a finite number of sets in T is also in T.The...
  4. Ahmed Abdullah

    Neat Workable Formula for Probability of Co-Occurrence in a Fixed Group

    I am interested in the cases where people are fixed. For example if we have 4 people , 2 are good at computer and 2 are math then it is impossible to have 3 people good at both computer and math. Which is different than your approach. The formula I have derived is P(r)= C(N,r)*C(N-r , m-r) *...
  5. Ahmed Abdullah

    Neat Workable Formula for Probability of Co-Occurrence in a Fixed Group

    Actually I am interested in the cases where resources are limited (4 people, 2 math guy , 2 computer guy in the example)
  6. Ahmed Abdullah

    Neat Workable Formula for Probability of Co-Occurrence in a Fixed Group

    The formula I have derived is P(r)= C(N,r)*C(N-r , m-r) * C(N-m, c-r) / ( C(N,m) * C(N,n)) N=Total people m=number of people good at math c=number of people good at computer r= number of people good at both I am assuming it is correct but it contains large N, m and c. I guess i have to use...
  7. Ahmed Abdullah

    Neat Workable Formula for Probability of Co-Occurrence in a Fixed Group

    If we have 4 people with 2 people good at math and 2 people good at computer. According to your formula we get a non zero probability for r=3 .
  8. Ahmed Abdullah

    Neat Workable Formula for Probability of Co-Occurrence in a Fixed Group

    What if being good at math and computer science is independent of each other.
  9. Ahmed Abdullah

    Neat Workable Formula for Probability of Co-Occurrence in a Fixed Group

    Of total N people, m people are good at mathematics and c people are good at computer science. What is the expected number of people good at both mathematics and computer science? Or what is the probability that r people are good at both mathematics and computer science. I have derived the...
  10. Ahmed Abdullah

    Rubik's cube group element with the smallest order

    I know. And I found it extremely helpful. What I meant by "Now I know" is that, I can find out notation for any position by simply solving it by the cube solver. Actually it was the best thing that happened on the day. Thanks. :)
  11. Ahmed Abdullah

    Rubik's cube group element with the smallest order

    Thank you very much. Now I know.
  12. Ahmed Abdullah

    Rubik's cube group element with the smallest order

    But how I'll convert that position to L R U D notation?
  13. Ahmed Abdullah

    Rubik's cube group element with the smallest order

    Is it easy to find? For example 10 divides the 1260 (order of ). How I am going to find an element of order 10 from this ... ??
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