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didnt I already answer this?
do you know permutations and combinations?

I meant do you understand permutations and combinations?

Go back to previous time you asked this, I gave more explanation on dhatraditya's work

now wat

i got that up to the ending but then i come w the decinmal

yes, probabilities are between 0 and 1 and typically decimals

(10C2*10C5)/(20C7) = 45*252/77520= 1134/7752 = 567/3876 = 189/1

189/1? how did you get that?

and then do u devide all them ?

i have no idea what you are talking about.

how do u get the answer?

What you have above is correct except the last fraction.

ok now what?

the end? If you want a decimal approximation you could plug that fraction into your calculator

all them?

they're all the same fraction (except the 189/1 which I have no idea where it came from)

so i would devide all those numbers? or?

6.835978835

so would the answer be 6.84?

oh come on!
what is 1134 divided by 7752?

0.1462848