A box has 60 balls, of which 26 are red, 16 are blue, and 18 are yellow. Balls are extracted at random then returned to the box. What is the probability that after performing this test three times exactly two are red and one is yellow?

Question

welshfella · Answer

a tree diagram would help with this one

anonymous · Answer

ok

mathmath333 · Answer

is answer $\dfrac{169}{1125}$

anonymous · Answer

i dont how u got that answer im just thinking about the tree @welshfella  said

mathmath333 · Answer

i mean is the answer already given in book

welshfella · Answer

its hard to draw a tree diagram with 3 draws!!!  lol

anonymous · Answer

perhaps u can attaches as a image file lol

welshfella · Answer

possible scenarios are
R R Y
R Y R
Y R R 

probability of   each of these is   26/60  * 26/60 * 18 / 60

work this out then multiply it by 3

anonymous · Answer

121168/180

welshfella · Answer

you have made a mistake somewhere

anonymous · Answer

i see

anonymous · Answer

12168/216000

anonymous · Answer

169/3000

welshfella · Answer

26/60  * 26/60 * 18 / 60 =  13/30 * 13/30 * 3/10 =  507 / 9000

welshfella · Answer

= 169/1000  yes

welshfella · Answer

now you need to multiply that by 3 because of the 3 different arrangements of the balls)

anonymous · Answer

169/1000 or 169/3000?

welshfella · Answer

sorry its

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