Question

each digit 0,1,2,3,4,5,6,7,8, an 9 is writting on a slip of paper and the slips are placed in a hat. if 3 slips of paper are selected at ramdom find the probl that the 3 numbers are greater then 5

Answer 1

3/10

Answer 2

i mean 4/10

Answer 3

No

Answer 4

It's \[\frac{4 \choose 3}{10 \choose 3}\]

Answer 5

there are ten choose 3 ways to choose three numbers out of ten
ten choose 3 is 10*9*8/3/2=120 .
This is your denominator.
There are 4 choose 3 ways to choose the 4 of the ten numbers that are greater than 5. 4 choose 3 is 4. answer is 4/120 = 1/30

Answer 6

Yeah, that's what I said ;p

Answer 7

yup. couldn't find n choose k in the template.

Answer 8

I always write equations manually. It's all just latex =)

{ n \choose k}

Answer 9

much easier than using the editor

Answer 10

thanks for the tip. {x\times y}\[\frac{a}{b}\]
just testing

Answer 11

oops
didnt work

Answer 12

You have to be sure your equation is inside the \[ \ ] bits (no space)

Answer 13

\[x \times y\]

Answer 14

\[\frac{a}{b}\]

Answer 15

damn

Answer 16

\[x\cdot y, \forall x \in N, f(g(x)) = (f\circ g)(x)\]

Answer 17

Hrm? you are making fractions?

Answer 18

trying to
typed \[\frac{a}{b}\]

Answer 19

it's working for me.. (I can see a over b)

Answer 20

it looks good in preview but doesn't post right

Answer 21

i see no fraction bar!

Answer 22

\[x\times y\]

Answer 23

got one

Answer 24

\[{n \choose k}\]

Answer 25

got it

Answer 26

Sometimes the fraction bar doesn't show up for you when you post stuff. if you go to a different question and come back it can fix itself.