Question

Kris forwards an e-mail to 5 people. Each of those people forward that e-mail to 5 more people. If this happens 2 more times, which expression shows the total number of people who have recived the e-mail, not including Kris

Answer 1

Answer:
`5+5^2+5^3+5^4`

Step-by-step explanation:

1) First forwarding: 5 e-mails

2) Second forwarding: 5 * 5 =
`5^(2)`

3) Third forwarding: 5 * 5 * 5 =
`5^(3)`

4) Fourth forwarding: 5 * 5 * 5 * 5 =
`5^(4)`

The number of people who have received the email, after Kris started forwarding the e-mail, not counting Kris, is:


`5+5^2+5^3+5^4`