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An urn contains 9 balls two of which are...

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 the same colour is `5/(84)` b. `3/9` c. `3/7` d. `7/(17)`

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RD SHARMA ENGLISH-PROBABILITY-All Questions
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  2. Two dice are thrown simultaneously. the probability of getting a pa...

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  3. An urn contains 9 balls two of which are red, three blue and four b...

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  4. A coin is tossed three times. Event A: two heads appear Event B: last ...

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  5. Five persons entered the lift cabin on the ground floor of an 8 flo...

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  6. A box contains 10 good articles and 6 defective articles. One item ...

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  7. A box contains 6 nails and 10 nuts. Half of the nails and half of t...

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  8. A bag contains 5 brown and 4 white socks. A man pulls out two socks. ...

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  9. If S is the sample space and P(A)=1/3P\ (B)a n d\ S=AuuB ,\ w h e r e\...

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  10. If A and B are two events, then P( A nnB)=?? a.) P( A )P( B ) b.) ...

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  11. If P(AuuB)=0. 8\ a n d\ P(AnnB)=0. 3 ,\ t h e n\ P( A )+P( B )= a. ...

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  12. A bag X contains 2 white and 3 black balls and another bag Y contains ...

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  13. Two persons A and B take turns in throwing a pair of dice. The first ...

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  14. The probability that in a year of 22nd centurychosen at random, there ...

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  15. From a set of 100 cards numbered 1 to 100, one card is drawn at random...

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  16. If A and B are two events such that P(A)=4/5, a n d\ P(AnnB)=7/(10), t...

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  17. If A and B are two events associated to a random experiment such that ...

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  18. If P(A)=3//10 , P(B=2//5) and P(AuuB)=3//5 then P(A//B)+P(B//A) equals...

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  19. Let P(A)=7/(13), P(B)=9/(13) and P(AnnB)=4/(13) . Then P( A //B)= 5/...

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  20. If P(A)=2/5,P(B)=3/10andP(AcapB)=1/5 then P(A'/B')cdotP(B'/A') is equa...

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