# Lets Count | 5 Nov, 2009

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

1. ### shabbirAdministratorStaff Member

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Count the triangles ?

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2. ### SaswatPadhi~ Б0ЯИ Τ0 С0δЭ ~

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Tough one, again :thinking:

3. ### nimeshNew Member

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23 Triangles

4. ### shabbirAdministratorStaff Member

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I could count more than 23

5. ### MridulaNew Member

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

6. ### MridulaNew Member

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Sorry.
I could count till 27 !!

7. ### KshiteejNew Member

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I think Mridula is correct.

I also can count upto 27 triangles.

8. ### shabbirAdministratorStaff 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. ### nimeshNew 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. ### xpi0t0sMentor

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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. ### xpi0t0sMentor

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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. ### xpi0t0sMentor

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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