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adam anthony and alice, thats 3 people so favorable is 3. and total is 10 choose 3 , correct ?
so 3 / 10 choose 3
3 / ( 10 choose 3) , remember 10 choose 3 is total ways of choosing 3 people out of ten , order does not count
and 3 cuz you have 3 favorable, they specified
yeah, its easy :0
well that one anyway
wait so answer is????
3 / ( 120
wait, why does it matter?
probability is usually in fraction form
if youre doing this online, let me know if its correct
it can be a decimal between 0 and 1
wait, is it right ?
I'm not sure? going over it on monday
let's do B
ok agnes, thats 1
2 other students? well there are 9 students left, and you choose 2
so 1 + 9 choose 2 , thats the favorable , and the denominator is again , the same
newton, do you concur?
( 1 + 9 C 2 ) / ( 10 C 3 )
oh newton is gone, darn
why did u add 1??
Oh by the way, if the answer to the first one is 1/40, and there are 10 * 9 * 8 ways of choosing the first 3 people, that implies that 18 teams will have those three in any order (they don't)
1 for agnes, since they told you , you must choose her
It makes more sense just to say there are 10C3 ways of picking the 3 students (nCr takes into account the ordering problem) and one of these will be the 3 we want - so it is simply 1/10C3, not 3/10C3
what??? I'm confused. what's the setup
i get 37/120 , unless i did something wrong
or should it be multiplied, hmmm
sorry it is ( 1 * 9 choose 2 ) / 10 choose 3
since there is 1 way to choose agnes, then there is 2 you have to choose among the 9 left
so 36/ 120 = 3/ 10
ah I see lol, but I still don't understand this permutation and combination stuff? is there a way that u can explain to me?
permutations is where order counts, combination is where order does not count
thats the "big" difference
how do u know what numbers to put for the probability
I don't get how u set up the numbers in order to find the probability
well we use multiplication rule
there are how many ways to choose agnes, one way. and for each of that way we can choose from whats left (9 people) 2 people we can choose. so we multiply these .
if you can do step one in k ways, and for each of those ways you can do step m, then there are a total of k * m ways
so we did ( 1 * 9C2) , thats the favorable
what grade r u in btw