How many codes are possible if repeats are not allowed and the second letter must be 'P' and the second digit must be '2'? Answer: If the wrong code is entered the vault automatically locks and the alarm sounds. Suppose repeating letters and digits are allowed in the code. What is ther probability of a thief breaking into the vault if the thief has no prior knowledge of the secret code? Answer:

How many codes are possible if repeats are not allowed and the second letter must be 'P' and the second digit must be '2'? Answer: If the wrong code is entered the vault automatically locks and the alarm sounds. Suppose repeating letters and digits are allowed in the code. What is ther probability of a thief breaking into the vault if the thief has no prior knowledge of the secret code? Answer:

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

A secret code for a bank vault consists of 4 letters, then 4 digits and then 2 more letters.

How many codes are possible if repeats are not allowed and the second letter must be 'P' and the second digit must be '2'?
Answer:
If the wrong code is entered the vault automatically locks and the alarm sounds. Suppose repeating letters and digits are allowed in the code. What is
ther probability of a thief breaking into the vault if the thief has no prior knowledge of the secret code?
Answer:

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