SOLUTION: What is the probability of a seven-digit (7) phone number containing the number seven (7)?
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Question 181936This question is from textbook
: What is the probability of a seven-digit (7) phone number containing the number seven (7)?
This question is from textbook
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
When you want the probability of a OR b OR c ...etc, you musrt
add the probabilities of each event occurring separately
The 1st digit can be 1-9 (0 is not allowed)
The probability of it being a is
The rest of the digits can be 0-9, so their probability is
The proibability of 1 number being a is then:
answer
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