I pretty confused... Help please???
Elijah forgot his pass code for a certain website. He knows it is made up of 5 digits and no digit can be repeated. If he randomly chooses 5 different digits, what is the probability that he chooses his pass code?

Option A: 1/252

Option B: 1/3125

Option C: 1/6048

Option D: 1/30240
Please explain too! Much appreciated! Thanks!

Question

I pretty confused... Help please??? 
Elijah forgot his pass code for a certain website. He knows it is made up of 5 digits and no digit can be repeated. If he randomly chooses 5 different digits, what is the probability that he chooses his pass code?

       Option A: 1/252

       Option B: 1/3125

       Option C: 1/6048

       Option D: 1/30240
Please explain too! Much appreciated! Thanks!

jim_thompson5910 · Answer

Are letters included? or just numbers?

anonymous · Answer

i think it's just numbers cuz it only says digits... :)

jim_thompson5910 · Answer

yeah that's what I was thinking too, but I'm not getting any of the answer choices

parthkohli · Answer

I guess that the number of combinations are 9 * 8 * 7 * 6 * 5 since no digit is repeated.

anonymous · Answer

So do you know what the answer is? haha and can you please explain? cuz i'm confused :O

parthkohli · Answer

Maybe I'm wrong....the total number of combinations possible are 15120. So it'd be 1/15120 :/

parthkohli · Answer

But that isn't in the options

anonymous · Answer

but it says no digit can be repeated.... maybe that will help? haha idk

jim_thompson5910 · Answer

oh wait, I was overthinking lol


There are 10 digits for the first slot
9 for the second
8 for the third
7 for the fourth
6 for the fifth

Giving you 10*9*8*7*6 = 30240 codes possible

parthkohli · Answer

I WAS JUST ABOUT TO SAY 10 FOR The first omg

parthkohli · Answer

You beat me to the race, jim

parthkohli · Answer

0 is included too.

jim_thompson5910 · Answer

Since there is only one way to get the password, the probability is 1/30240

anonymous · Answer

ohhhhh, i see!!! I get it now... :) thanks!!! So the answer is 1/30240? option D?? and lol @ParthKohli

parthkohli · Answer

yep

anonymous · Answer

awesome!! thanks! i totes understand it now :)

jim_thompson5910 · Answer

that's great

anonymous · Answer

and can somebody give @ParthKohli a medal too? I can only give one for some weird reason.. lol thanks!

parthkohli · Answer

No need

anonymous · Answer

Thanks for giving @ParthKohli a medal :)

parthkohli · Answer

Oh thanks jim!

anonymous · Answer

haha what are the medals for? i don't really get it.. i just know you give it to who helps you.. haha

parthkohli · Answer

Hmm correct. They are to score the helpfulness of people. Jim is on the highest smartscore possible.

anonymous · Answer

oh cool! haha :) Thanks you guys :)