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Thread: brain teaser again.................?

  1. #1
    Join Date
    Dec 2007
    Posts
    1

    Default brain teaser again.................?

    if u r given 'n' rods of length{1,2,3,4.....n} respectively.
    what is the maximum no. of triangles that can be formed using these rods at a time?
    one rod can be used only once.........
    for example if n=5 , the max. no. of triangles formed will be 1..........using the combination(3,4,5)
    so once again read it carefully....
    you cant use one rod more than once
    suppose n=5 ,then the answer is 1
    using combination(3,4,5) or (2,3,4)
    if u r using rod "3" in one combination
    you cant use it in another combination..
    in other words you have to show all your combinations keeping them on a table at a time....and you have to exploit maximum no. of rods possible
    for simplicity try to device a method for n=100 and generalise it for n.....
    hope you all understand the question better now.........
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  2. #2
    Join Date
    Dec 2007
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    1

    Default

    wow, well blown away on this one. lol
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  3. #3
    Join Date
    Dec 2007
    Posts
    1

    Default

    hummmnnn,,,,uh??wat?
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  4. #4
    Join Date
    Aug 2009
    Posts
    15

    Default

    for 100: 32 triangles
    for n : [(n-1)/3] where [] denotes greatest integer function
    based on principle that sum of any two sides of triangle will be greater than 3rd side....so side of length one cant be included in any combination...all others will be used serially

  5. #5

    Default

    why are we making triangles??!! :-0 i think we should make circle!! ao that it could be one!!

  6. #6

    Default

    yes you are right amrita

  7. #7

    Default

    Wow It is very nice...

  8. #8
    Join Date
    Jul 2013
    Location
    Illinois
    Posts
    13

    Default

    difficult one.....

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