westpac maths comp (1 Viewer)

[iambored]

wat did u think?

they changed the rules! i think they're better!

 

[sukiyaki]

yeh the last section ay?
it was okay the 1st 20!
if only i had a bl00dy calculator!

 

[babydoll_]

yeah that last section killed me... oh well... i skipped most of em... ill get at least 24 marks

 

[iambored]

wat did any1 get for the first one in the last section? the car one?

 

[:: ck ::]

i did alrite.. answered 3 in last section
year 11 do same one as year 12 yeah?

did u guys get 24 triangles for that dot question

 

[iambored]

umm i think i got 24 triangles, was 24 the second highest number?
yeah yr 11 & 12 did the same one

 

[sukiyaki]

Originally posted by :: ryan.cck ::


did u guys get 24 triangles for that dot question

the connecting vetex one? 0_O oh shiet i put "10"

 

[Chang]

i got sumthing in the 20's as well... cant remember which one.

How about the 3x3 square split into 9 1x1 cubes. i got 6, u guys?

 

[iambored]

that was being discussed in the ext2 thread i think
where was that question?? in the last section?? i think i shud have read them a nit more carefully, apparently some were do-able

 

[babydoll_]

i chose 22
does anyone want the questions? the teacher let me take the booklet

 

[iambored]

we should b getting the booklet soon

 

[crazybrad]

i got 6 for the car question
i thought the first twenty were easy and the last ten i got 5 and left 5, i liked the old scoring system, you could get negative score lol

 

[:: ck ::]

i found out the correct answer was 24 triangles yesssss

 

[underthesun]

that's right, 24 is the number. I counted one by one while someone damn used permutations on it.. smartass

Is the result before the HSC?

 

[iambored]

permutations? really? wow, i counted them all 2

 

[Fosweb]

Combinations way:
there are 7 dots, with a line of 5 and a line of 3 - like: ( .'s are just for spacing...)

* * * * *
. . . *. . .
. . . *. . .

You need 3 dots to make a triangle. So there are
7C3 = 35 different 'triangles'

However: some of these are on the lines, and so they arent actually triangles. There are two lines.

5C3 = 10 'triangles' are on the line with 5 dots, and
3C3 = 1 'triangle' is on the line with 3 dots.

So: there are 7C3 - 5C3 - 3C3 = 24 triangles all up.

 

[iambored]

wow thats amazingly smart!

 

[sukiyaki]

^ whoA? ... and your in year 12? 0_O!!!!!!!!!!!

 

[Fply]

well !! It's the best solution I get