in a city of 10000 people everybody has a phone with a valid 7 digit phone number, what is the probablity that a person dialing 9999999 would be able to make a valid telephone call

Question

hartnn · Answer

1/10000

hartnn · Answer

i may be wrong.

anonymous · Answer

yes you are , actually what you have to find is , no of ways a seven digit number can be distributed among 10000 people.

hartnn · Answer

can u explain, if u know ??

anonymous · Answer

sorry i don't know the answer that's why i asked

anonymous · Answer

where is the tab for posting more questions , i cant seem to find it

hartnn · Answer

if u want to post 1 more question, u need to close this question first...can't ask more than 1 question at a time...

anonymous · Answer

thats bad, i think that's the reaon  why open study has only a handful of users online

hartnn · Answer

if the facility of asking more than 1 question is given, then many students will post their entire assignments at a time!

anonymous · Answer

whats the issue it will increase the users and questions will be answered more frequently

cwrw238 · Answer

obviously only some of the 7 digit numbers can be allocated amongst 10,000 people 
i f we assume that the numbers are chosen randomly the the probability of any one 7-dogit number being all coated to someone is 10,000 / 9999999 or very close to 1/1000

anonymous · Answer

yes looks correct..

anonymous · Answer

why i m not able to close this question

karatechopper · Answer

U could bump the Question