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A bag contains n coins of which five of ...

A bag contains n coins of which five of them are counterfeit with heads on both sides and the rest are fair coins. If one coin is selected from the bag and tossed, the probability of getting head is `5//8` then n=

A

`16`

B

`20`

C

`24`

D

`28`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-PROBABILITY-Exercise-II
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  2. A man alternately tosses a coin and throws a die continuously . The pr...

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  3. A biased coin with probability p, 0 lt p lt 1 of heads is tossed until...

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  4. On a toss of two dice, A throws a total of 5. Then the probability tha...

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  5. A and B throw a pair of dice. A wins if the throws 6 before B throws 7...

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  6. India plays two hockey matches each with Pakistan and England. In any ...

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  7. An article manufactured by a company consists of two parts A and B. In...

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  8. The probability of India winning a test match against West-Indies is 1...

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  9. The key for a door is in the bunch of 10 keys. A man attempts to open ...

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  10. A letter is known to have come either from 'TATANAGAR' or 'CALCUTTA' ....

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

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  12. In the random experiment of tossing two unbiased dice, let E be the e...

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  13. A number n is chosen at random from S={1,2,3,…..50}. Let A={n in S :n+...

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  14. Observe the following lists:

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  15. Suppose that E1 and E2 are two events of a random experiment such that...

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  16. Assertion (A) : The probability of getting exactly 2 heads in tossing ...

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  17. Out of (2n+1) tickets consecutively numbered , three are drawn at rand...

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  18. A bag contains n coins of which five of them are counterfeit with head...

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  19. A is one of 5 horses that entered the race and for it to be rided by o...

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  20. The probability that a teacher will conduct an unannounced test during...

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