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An urn contains nine balls of which thre...

An urn contains nine balls of which three are red, four are blue and two are green. Three balls are drawn at random without replacement from the urn. The probability that the three balls have different colour, is

A

`1/3`

B

`2/7`

C

`1/21`

D

`2/23`

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MODERN PUBLICATION-PROBABILITY-EXERCISE
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  4. A signal which can can be green or red with probability 4/5 and 1/5 re...

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  5. If C and D are two events such that CsubD and P(D)ne0, then the correc...

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  6. Consider 5 independent Bernoulli's trials each with probability of suc...

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  8. Three numbers are chosen at random without replacement from {1,2,3,……8...

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  9. Four fair dice , D1 D2, D3 and D4 each having six faces numbered 1,2,3...

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  10. Four person independently solve a certain problem correctly with pro...

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  12. if 12 identical balls are to be placed in 3 identical boxes, then the ...

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  13. Let two fair six-faced dice A and B be thrown simltaneously. If E(1) i...

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  14. If P(A)=7/13, P(B)=9/13 and P(AnnB)=4/13, evaluate P(A/B).

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  15. Let E and F be events with P(E)=3/5, P(F)=3/10 and P (E cap F)=1/5. Ar...

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  16. An urn contains 10 black and 5 white balls. Two balls are drawn from t...

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  17. Probability of solving specific problem independently by A and B are 1...

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  18. Probability of solving specific problem independently by A and B are 1...

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  19. From a lot of 30 bulbs which include 6 defectives, a sample of 4 bulbs...

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