Question

There are 8 people who work in an office. If each person sends each other person at the office one e-mail on a particular day and there is only one e-mail between every possible pair, how many e-mails will be sent that day?

Answer 1

first guy will send one to each other person in the office, so he sends 7

second guy will send one to each other person in the office except the one guy he already received one from, so he sends 6

third guy will send one to each person except the two that he already received from, he sends 5

and so on...

Answer 2

So then that would b 8! = 40,320. Does that sound right?

Answer 3

woah, thats a lot of emails...

you just need to add up those numbers

Answer 4

7 + 6 + 5 + 4 + 3...

Answer 5

not multiplied

Answer 6

so it would b 28?

Answer 7

yep

Answer 8

Thank you!