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23 December, 13:33

A bag contains 30 lottery balls numbered 1-30 a ball is selected, not replaced, then another is drawn. find each probability

p (a 2 - digit number, then 4)

p (19, then a multiple of 4)

p (24, then a number less then 15)

p (two perfect squares)

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  1. 23 December, 13:42
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    The probability of the first event with x possible outcomes is equal to x/30. Also, the probability of the second event with y possible outcomes is y/29.

    (1) P of 2 digit number, 21/30

    P that the number is 4 is 1/29

    Multiplying both probabilities will give us 7/290

    (2) P that number is 19 is 1/30

    P that the number is multiple by 4 is 6/29

    The answer is 1/145

    (3) P that number is 24 is 1/30

    P that number is less than 15 is 14/29

    The answer should be 7/435.

    (4) P that number 1st number is perfect square is 5/30

    P that second number is perfect square is 4/29.

    The answer is 2/87.
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