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In Exercises 5鈥36, express allprobabilitiesas fractions.

ATM Pin Numbers A thief steals an ATM card and must randomly guess the correct pin code that consists of four digits (each 0 through 9) that must be entered in the correct order. Repetition of digits is allowed. What is the probability of a correct guess on the first try?

Short Answer

Expert verified

The probability of a correct guess on the first try is equal to110000.

Step by step solution

01

Given information

The pin for accessing the ATM card consists of four digits from 0 to 9 with the digits that can repeat.

The digits need to be entered in the correct order.

02

Define probability

The probability of an event A is calculated using the following formula:

PA=NumberoffavorableoutcomesTotalnumberofoutcomes

The number of total ways to design a pin can be computed using the multiplication rule, multiplying the number of available options at each place of the pin.

03

Compute favorable and total number of outcomes

Let A be the event of making a correct guess.

Given that repetition is allowed, the number of digits available for each place of the pin sequence is 10.

The total number of ways possible for guessing the ATM pin is given as follows:

10101010=10000

The number of favorable ways to guess the pin in the correct order is 1.

04

Compute the probability

The probability of guessing the correct pin on the first try is computed as follows:

PA=110000

Therefore, the probability of guessing the correct pin on the first try is 110000.

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