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Bob's password consists of a non-negative single-digit number followed by a letter and another non-negative single-digit number. What is the probability that Bob's password contains an odd single-digit number?

 Oct 1, 2021
 #1
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 he can have   O  - letter-  O

                        O               E

                        E               E

                        E               O

 

3/4 chance it contains an odd single digit

 Oct 1, 2021

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