+0  
 
-1
317
3
avatar+397 

deleted.

 Nov 14, 2019
edited by sinclairdragon428  Nov 20, 2019
 #1
avatar
0

The probability is 7/9.

 Nov 15, 2019
 #2
avatar+8956 
+1

My guess:

 

Total number of arrangements of  0, 1, 6,  and  7   =   4!   =   24

 

For each of these, there are 2 possible choices for the first three digits.

 

So the total number of possibilities  =  24 * 2   =   48

 

Only one of these 48 possibilities is correct, so the probability that Fatima chooses the correct one is

 

1 / 48

 

----------(below is my reassurance that there are actually 24 ways to arrange the last 4 digits!)----------

0167

0176

 

0617

0671

 

0716

0761

 

1067

1076

 

1607

1670

 

1706

1760

 

6017

6071

 

6107

6170

 

6701

6710

 

7016

7061

 

7106

7160

 

7601

7610

 Nov 15, 2019
 #3
avatar+397 
0

thank you for all the help!

hectictar had the correct answer :)

 Nov 15, 2019

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