Express this information as a function, where f(x) represents the amount of money charged and x represents the number of minutes
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Answer: 0.9995
Step-by-step explanation:
Number of digits to make any code (0 to 9) = 10
If repetition is allowed , then the total number of possible four digits pin codes that can be formed=
The number of ways to make for digit code without repetition of digits =
The number of ways to make for digit codes having repetition =
Probability that a person has pin code that has repetition:-
Let x be number of pin codes with repeating digits.
Using binomial probability distribution formula ,
If the PIN codes of seven people are selected at random, then the probability that at least one of them will have repeating digits:-
Hence, the probability that at least one of them will have repeating digits = 0.9995