Multiple Choice Questions on For each element in a set of size 2n an unbiased coin is tossed The 2n coin is tossed are indep........... for NDA Exam Preparation

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Multiple Choice Questions

For each element in a set of size 2n an unbiased coin is tossed The 2n coin is tossed are indep...........

Mathematics (NDA) Probability
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    For each element in a set of size  2n, an unbiased coin is tossed. The 2n coin is tossed are independent. An element is chosen if the corresponding coin toss were heads . The probability that exactly n elements are chosen is? 

    2nCn  /2n

    Incorrect Answer

    2nCn /4n

    Correct Answer

    1/2ncn  

    Incorrect Answer

    1/5

    Incorrect Answer
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    Explanation:

    Probability exactly n items chosen  out of 2n

    = 2nCn   (1/2)n  (1/2)2n-n  

    =2nCn   (1/2)n(1/2)n 

    =2nCn  /22n                      

    =2nCn  /4n    

    By: bhavesh kumar singh
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