Question

From an urn containing 6 balls,3 white and 3 black ones, a lerson select at random an even nunber of balls (all the different ways of drawing an even number of balls are considered equally probable, irrespective of number). Then the probability that there will be the same number of black and white balls among them is

Answer 1

Person*

Answer 2

@ganeshie8

Answer 3

hey

Answer 4

Hello! Would you pls help?

Answer 5

I actually added up the probability when he draw 2 balls ,4 balls and 6 balls..

Answer 6

For two balls v can write that it shud be 3C1*3C1/6C2

Answer 7

@ganeshie8 will u help?

Answer 8

@knov

Answer 9

wait a sec. i on the other question.

Answer 10

okay, so there are 3 even numbers in number 6.

Answer 11

2, 4, 6. the person will select randomly from these numbers.

Answer 12

from here we are looking for the probability of same number of black and white balls.

Answer 13

Yes ..he can either select two or four or six balls out of the bag

Answer 14

yes.

Answer 15

lets look at the case in which the random even number is 4

Answer 16

in this case have four over four combinations.

Answer 17

3C2*3C2 is favourable case

Answer 18

we*

Answer 19

6C4 r total cases.

Answer 20

you mean including the all cases ?

Answer 21

* symbol is for multiplication

Answer 22

No ! Just drawing four balls out of 6

Answer 23

yes, you are correct.

Answer 24

So u intend to say this that probability of drawing four balls out of 6 is
3C2*3C2/6C4
Similarly we can solve for the rest two cases where balls drawn are two or six

Answer 25

and then we shud add them all to get the ans

Answer 26

no, that would be just one tho.

Answer 27

i just miscalculated it. sry

Answer 28

it's 6^four

Answer 29

so here we are looking for all b b w w cases.

Answer 30

Did u read my last post ?

Answer 31

Is that what u want to do next?