Question

You have 4 math books, 3 english books, and six science books. If you select books at random what is the probability of picking 3 english books?

Answer 1

how many books u have ??

Answer 2

@madison712 : lets do it together.. hope u dont mind..

Answer 3

may be 13 :/

Answer 4

add all them together.. you will get total number of books..

Answer 5

you have total of 6+4+3 = 13 books..

now, picking book and it shd be English.. so u have 3 English books..

So the probability would be 13C3...

Answer 6

even i think you are right :)

Answer 7

probabilities aint greater than 1

Answer 8

i think a hypergeometric probability might be more condusive

Answer 9

\[\large\frac{\binom{M}{k}\binom{N-M}{n-k}}{\binom{N}{n}}\]

Answer 10

oh sorry.. small mistake..

Answer 11

it should be 3/13...

Answer 12

@amistre64 : ?? what say ?

Answer 13

or one way of looking at it might be

if we put all 13 books into a box; the probability of picking an E in
the first go around is: 3/13

out of the remaining 12 books ; the probability of picking an E in
the 2nd go around is: 2/12

out of the remaining 11 books ; the probability of picking an E in
the 3rd go around is: 1/11

P(A and B and C) = P(A) * P(B) * P(C)

Answer 14

hmmm, agree..

i thought, just one book.. thnx !!!

Answer 15

youre welcome