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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

`(2)/(7)`

B

`(1)/(21)`

C

`(2)/(23)`

D

`(1)/(3)`

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The correct Answer is:
A
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ARIHANT MATHS ENGLISH-PROBABILITY-Exercise (Questions Asked In Previous 13 Years Exam)
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  2. Four numbers are chosen at random (without replacement) from the set ...

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  3. An urn contains nine balls of which three are red, four are blue and ...

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  4. Let U(1) and U(2) be two urns such that U(1) contains 3 white and 2 re...

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  5. Let U1 and U2 be two urns such that U1 contains 3 white and 2 red ball...

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  7. Consider 5 independent Bernoulli's trials each with probability of at ...

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  8. If C and D are two events such that CsubD""a n d""P(D)!=0 , then the c...

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  9. Let A, B, C be pariwise independent events with P(C) >0 and P(AnnBnnC)...

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  10. A ship is fitted with three engines E1,E2 and E3. The engines function...

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  11. four fair dice D1, D2,D3 and D4 each having six faces numbered 1,2,3,4...

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  12. If X and Y are two events such that PX//Y)=(1)/(2), P(Y//X)=(1)/(3) an...

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

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  14. A multiple choice examination has 5 questions. Each question has three...

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  15. Four person independently solve a certain problem correctly with pr...

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  16. Of the three independent events E(1),E(2),and E(3), the probability th...

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  17. A box B(1) contains 1 white ball, 3 red balls, and 2 black balls. An- ...

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  18. A box B1 contains 1 white ball, 3 red balls and 2 black balls. Another...

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  19. Let A and B be two events, such that P(bar(A cup B))=(1)/(6), P(A cap ...

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  20. Three boys and two girls stand in a queue. The probability, that the n...

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