We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
+1
93
4
avatar+893 

Answer: 13/225

 

What I did:

 Jul 28, 2019
 #1
avatar+5798 
+2

you left out all the multiples of 100

 Jul 28, 2019
 #2
avatar+893 
+1

So then the possible combinations are:

1-0-0  1

1-1-1  1

1-2-2  3

1-3-3  3

1-4-4  3

1-5-5  3

1-6-6  3

1-7-7  3

1-8-8  3

1-9-9  3

2-0-0  1

2-2-4  3

2-3-6  6

2-4-8  6

3-0-0  1

3-3-9  3

4-0-0  1

5-0-0  1

6-0-0  1

7-0-0  1

8-0-0  1

9-0-0  1

 

Total: 52

Probability is 52/900=26/450=13/225.

 

I see my mistake. Thanks Rom!!!

dgfgrafgdfge111  Jul 28, 2019
 #3
avatar
+1

n=0;p=0;cycle: a=(100+n);b=int(a/100);c=int(a/10);d=c%10;e=a%10;n++;f=if(b==d*e or d==b*e or e==b*d and e!=0 and d!=0, goto loop, goto cycle);loop:p=p+1;printa,",  ",;if(n<868, goto cycle, 0);print"Total = ",p
100 ,  111 ,  122 ,  133 ,  144 ,  155 ,  166 ,  177 ,  188 ,  199 ,  200 ,  212 ,  221 ,  224 ,  236 ,  242 ,  248 ,  263 ,  284 ,  300 ,  313 ,  326 ,  331 ,  339 ,  362 ,  393 ,  400 ,  414 ,  422 ,  428 ,  441 ,  482 ,  500 ,  515 ,  551 ,  600 ,  616 ,  623 ,  632 ,  661 ,  700 ,  717 ,  771 ,  800 ,  818 ,  824 ,  842 ,  881 ,  900 ,  919 ,  933 ,  991 ,  Total =  52
The probability is = 52 / 900 =13 / 225

 Jul 28, 2019
 #4
avatar+893 
0

Is this a computer program?

dgfgrafgdfge111  Jul 28, 2019

13 Online Users

avatar
avatar