+0  
 
0
34
1
avatar

Hong, the mailperson, delivers 5 letters to five houses. what is the probability she delivers all five letters correctly?

 Mar 17, 2021
 #1
avatar+909 
0

First house has a chance of 1/5. (1 mail is correct, you have 5 mails.)

Second house has a chance of 1/4. (1 mail is correct, you have 4 mails, only 4 since you have you already delivered the first house.)

Third house has a chance of 1/3. 

Fourth house has a chance of 1/2. 

Fifth house has a chance of 1/1. 

What's 1/5*1/4*1/3*1/2*1/1?

 

=^._.^=

 Mar 17, 2021

46 Online Users

avatar
avatar
avatar
avatar