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Math Help - number of accidents probablitiy

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    number of accidents probablitiy

    7 accidents occur in a week. What is the probablitiy that all the accidents occur in the same day??

    THis is what aI did. I assumed , that the probablitiy of an accident occuring is equally likey, so the probablitiy of an accident occuring in a day is 1/7 .. the probablity of a second accident in a day is 1/7 also... so P ( 1st accident & 2nd & 3rd ..... 7th ) should be (1/7 )^7 right ?? but answer is ( 1/7 )^ 6
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    Quote Originally Posted by ice_syncer View Post
    7 accidents occur in a week. What is the probablitiy that all the accidents occur in the same day??

    THis is what aI did. I assumed , that the probablitiy of an accident occuring is equally likey, so the probablitiy of an accident occuring in a day is 1/7 .. the probablity of a second accident in a day is 1/7 also... so P ( 1st accident & 2nd & 3rd ..... 7th ) should be (1/7 )^7 right ?? but answer is ( 1/7 )^ 6
    There are 7 days, each which could be the 'lucky' day. So you have to multiply your answer by 7.
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    OH OK you mean, P(sunday OR monday ..... SAT ) ? I see.
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