+0  
 
0
155
4
avatar+561 

Bob's password consists of a non-negative single-digit number followed by a letter and another non-negative single-digit number. What is the probability that Bob's password consists of an odd single-digit number followed by a letter and a positive single-digit number?

Lightning  Mar 22, 2018
 #3
avatar+87657 
+2

P (  odd single digit number )  = 

( 5 odd single digits / 10 non-negative single digits)  = (5/10)  = 1/2

 

P (positive single digit number )  = 

(9 positive single digits / 10 non-negative single digits)  = 9/10

 

The total probability is   (1/2) (9/10)  =  9/20

 

 

 

cool cool cool

CPhill  Mar 22, 2018
 #4
avatar+92933 
+1

Sounds good to me Chris ..

I might have not realized that the last digit could not be 0     laugh

Melody  Mar 23, 2018

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