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An urn contains 5 red and 5 black balls....

An urn contains 5 red and 5 black balls. A ball is drawn at random, its colour is noted and is returned to the urn. Moreover, 2 additional balls of the colour drawn are put in the urn and then a ball is drawn at random. The probability that the second ball drawn is red will be

A

`5/12`

B

`1/2`

C

`7/12`

D

`1/4`

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The correct Answer is:
A, B
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SURA PUBLICATION-INTRODUCTION OF PROBABILITY THEOREM-EXERCISE 12.5
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  4. A matrix is chosen at random from a set of all matrices of order 2, wi...

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  5. A bag contains 5 white and 3 black balls. Five balls are drawn success...

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  6. If A and B are two events such that A sub Band P(B) ne 0, then which o...

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  7. A bag contains 6 green, 2 white, and 7 black balls. If two balls are ...

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  8. If X and Y be two events such that P(X//Y) = 1/2, P(Y//X) = 1/3 and P(...

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  9. An urn contains 5 red and 5 black balls. A ball is drawn at random, it...

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  10. A number x is chosen at random from the set {1,2,3,4, ………., 100}. Defi...

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  11. If two events A and B are independent such that P(A) = 0.35 and P(A uu...

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  12. If two events A and B are such that P (barA) = 3/10 and P(A nn barB) =...

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  13. If A and B are two events such that P(A) = 0.4, P(B) = 0.8 and P(B//A)...

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  14. There are three events A, B and C of which one and only one can happen...

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  15. If a and b are chosen randomly from the set {1, 2, 3, 4} with replacem...

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  16. It is given that the events A and B are such that P(A) = 1/4, P (A//B)...

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  17. In a certain college 4% of the boys and 1 % of the girls are taller th...

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  18. Ten coins are tossed. The probability of getting at least 8 heads is

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  19. The probability of two events A and B are 0.3 and 0.6 respectively. Th...

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  20. If m is a number such that m le 5, then the probability that quadratic...

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