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4 newly wedded couples are dancing at a function , if the partner is selected at random , then the chance that no husband is dancing with his own wife is

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      Required probability 

                frac^4p_44! [1-frac11!+frac12!-frac13!+frac14!]

    Rightarrow        =[1-1+frac12-frac16+frac124]=frac924. 



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Deependra Verma

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