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Martha types a 4−digit code into a keypad to unlock her car doors. The code uses the numbers 1 and 0. If the digits are selected at random, what is the probability of getting a code with exactly three 0's?

 Feb 20, 2020
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We have   2^4  =  16  possible codes

 

Codes with  three 0s

 

0001

0010

0100

1000

 

So....the probability  is    4  / 16   =   1  / 4

 

 

cool cool cool

 Feb 20, 2020

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