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28 January, 03:07

Brian's school locker has a three-digit combination lock that can be set using the numbers 5 to 9 (including 5 and 9), without repeating a number.

The probability that the locker code begins with a prime number is what

%. The probability that the last digit of the locker code is an odd number is what

%.

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  1. 28 January, 03:35
    0
    The probability that the locker code begins with a prime number is:

    2/5 = 40%

    The probability that the last digit is an odd number which will make the locker code an odd number is:

    3/5 = 60% ...

    Step-by-step explanation:

    According to the given statement Brian's school locker has a three-digit combination lock that can be set using the numbers 5 to 9 (including 5 and 9), without repeating a number.

    Therefore the digits that can be used in the code are 5,6,7,8 or 9.

    A) The probability that the locker code begins with a prime number is what %.

    Two of the digits are prime number: 5 and 7

    Thus the probability that the locker code begins with a prime number is:

    2/5 = 40%

    B) The probability that the last digit of the locker code is an odd number is what %.

    If the last digit is an odd number than the locker code is an odd number.

    There are three odd numbers: 5,7,9

    Thus the probability that the last digit is an odd number which will make the locker code an odd number is:

    3/5 = 60% ...
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