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A coin is tossed n times. The probabilit...

A coin is tossed n times. The probability that head will turn up an odd number of times , is

A

`(1)/(2)`

B

`(n+1)/(2n)`

C

`(n-1)/(2n)`

D

`(2^n-1-1)/(2^n)`

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The correct Answer is:
A
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OBJECTIVE RD SHARMA ENGLISH-DISCRETE PROBABILITY DISTRIBUTIONS-Exercise
  1. In order to get a head at least once with probability >=0.9,the minimu...

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  2. The probability that a man will hit a target in shooting practise is 0...

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  3. If A and B each toss three coins. The probability that both get the sa...

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  4. In a box containing 100 bulbs, 10 bulbs are defective. Probability th...

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  5. The box contains tickets numbered from 1 to 20. Three tickets are draw...

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  6. An unbiased coin is tossed is tossed a fixed number of times. If the p...

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  7. A coin is tossed n times. The probability that head will turn up an od...

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  8. Two coins are tossed five times. The probability that an odd number of...

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  9. A six-faced dice is so biased that it is twice as likely to show an ev...

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  10. A fair coin is tossed n times. if the probability that head occurs 6 t...

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  11. An unbiased coin is tossed n times. Let X denote the number of times h...

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  12. A fair coin is tossed is fixed number of times. If the probability of ...

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  13. A carton contains 20 bulbs ,5 of which are defective. The probability ...

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  14. In a precision bombing attack, there is a 50% chance that any one bomb...

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  15. The probability of a man hitting a target is 1/4. How many times must ...

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  16. IF the mean and S.D. of binomial distribution are 20 and 4 respectivel...

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

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  18. The mean and standard deviation of a binomial variate X are 4 and sqrt...

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  19. The probability distribution of a random variable X is given by. {:(...

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  20. For a binimial variate X with n=6, if P(X=4)=(135)/(2^(12)) then its v...

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