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Lets Count | 5 Nov, 2009

Discussion in '$1 Daily Competition' started by shabbir, Nov 5, 2009.

  1. shabbir

    shabbir Administrator Staff Member

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    Count the triangles ?

    [​IMG]
     

    Attached Files:

  2. SaswatPadhi

    SaswatPadhi ~ Б0ЯИ Τ0 С0δЭ ~

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    Tough one, again :) :thinking:
     
  3. nimesh

    nimesh New Member

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    23 Triangles
     
  4. shabbir

    shabbir Administrator Staff Member

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    I could count more than 23
     
  5. Mridula

    Mridula New Member

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    Nimesh has left one more i.e. BIG one !
    So total is 24 only!!
     
  6. Mridula

    Mridula New Member

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    Sorry.
    I could count till 27 !!
     
  7. Kshiteej

    Kshiteej New Member

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    I think Mridula is correct.

    I also can count upto 27 triangles.
     
  8. shabbir

    shabbir Administrator Staff Member

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    Me too and here is the breakdown.

    Lets define smallest possible triangle as Unit and so

    1 Unit triangles = 16
    4 Unit triangles = 7
    9 Unit triangles = 3
    All Unit triangles = 1
     
  9. nimesh

    nimesh New Member

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    I missed on the 4 units ones, and I'd counted the big one :(
    Did not had time to reheck after shabbirs reply.

    Congrats Mridula :cheers:
     
  10. xpi0t0s

    xpi0t0s Mentor

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    26, because there are only 6 4-unit ones.
    16 size 1
    6 size 4
    3 size 9
    1 size 16
    total 16+6+3+1=26
     
  11. xpi0t0s

    xpi0t0s Mentor

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    1
    2 3
    4 5 6
    7 8 9 a
    b c d e f
    The only possible points below which a 4-unit triangle can exist are 1 2 3 4 5 6.
    The only 4-unit triangle starting, e.g. at 7 is the one covering 7 4 8 2 5 9 which is the same as the one starting at 2.
     
  12. xpi0t0s

    xpi0t0s Mentor

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    Repost this time with code tags to preserve the formatting
    Code:
        1
       2 3
      4 5 6
     7 8 9 a
    b c d e f
    
    Oops no there is another one, sorry, 456 89 d. 27 it is then :)
     

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