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basically you need to calculate
P(6 red or 6 blue or 6 white)

- then you find probablity of red on third and fourth draw in a similar way

now because these draws are independent to find probability of getting 4 reds you multiply
them

so P( 4 reds) = 1/3 * 5/17 * A * B)
where A and B are what you get for draws 3 and 4

have you any questions on the above posts?

lol well it seems @welshfella has this problem . Hope you understand ;) @amool

Thank you so much. I understand much better now.

good

ok sorry how did you get the 5/17.

so for 4th draw what is P(red ball)?

so it will be 3/15 = 1/5 I think this will be the 4th draw

right

Thanks for baring with me now I fully know the method thank you.

yeah it is .004902

yes
Now the probabilities of getting 4 blues and 4 whites is exactly the same
both 0.004902

so ts 3 * 0.004902

got it
.014706