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Someone likes advance reading :D
wut do u mean
First one can actually be done without the use of combinations... but more on that later.
Basic concept of probability, @uri ?
I don't really understand the question :D
:3 That tends to happen when you read (too far) in advance :D Anyway, the gist of probability (when it's discrete) is that you're counting the number of 'good' outcomes and dividing it by the total number of outcomes...
So, let's forget about the current question for the moment, and just say, we're trying to get the probability of drawing JUST ONE black ball, aye? :)
Everyone looking at my Ques yo!
It's a weekend, interesting questions are hard to come by @uri :)
its a trick question. there are no balls.
@chris00 Explain me.
terenz are u gonna answer this or shud i take over... u started something
i guess ill take over
say these 4 spots are how u draw the balls
now after the 8/14 chance u draw black first, u have 7/13 chance to draw black
Who says? :p
hm, think about it like this
how can u arrange 5 ppl in 3 spots
Idk...on each other.
u have 5 choices for the first spot|dw:1371299645056:dw|
then u will have 4 choices because only 4 ppl are left to choose from after you pick 1 guy, then for every first guy u pick from which u have 5 guys to pick each case will have 4 different guys u can pick from on the 2nd turn
so 5*4 for 2 places and then 5*4*3 for 3 places
instead of working with whole numbers, we are working with probability numbers for your case
think of it like this say there is half a chance your kid will be a boy, so whats the chance both of your kids will be boys
on the first child you have 1/2 chance of boy, and then from there another 1/2 chance on the 2nd boy, so out of total cases, u have 1 case will give u right result
same way is how you do this you divide by the case that u want / the total number of cases
now what iff i asked this questions a bit differently
say there are 5 people 2 are girls and 3 are boys
what is the chance that you pick both boys on the first case
what is the chance u will pick a boy on the first turn
Sorry guys, my internet really hates me.
oh ok i thought u gave up on her
Me? No, I only give up on people that absolutely refuse to learn :D
And I didn't understand anything because i was offline...
I'll ask this ques again..tomorrow.