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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 colours is :

A

`1/3`

B

`2/7`

C

`1/21`

D

`2/23`

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • An urn contains nine balls of which three are red four are blue and two are green three balls are drawn at random the probability that the three balls different colours is

    A
    `1/3`
    B
    `2/7`
    C
    `1/21`
    D
    `2/23`

  • An urn contains 9 balls two of which are red, three blue and four black. Three balls are drawn at random. The probability that they are of same colour is

    A
    `5/84 `
    B
    `3/9 `
    C
    `3/7 `
    D
    ` 7/17`

  • Out of 21 ticket marked 1,2….21 , three are drawn at random without replacement . The probability that these numbers are in A.P is :

    A
    `9/15`
    B
    `13/261`
    C
    `14/261`
    D
    `10/133`

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