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22 October, 13:26

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

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  1. 22 October, 15:59
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    Answer: 5 + 5^2 + 5^3 + 5^4

    Explanation:

    1) First time, when Kris forwards the e-mail it reaches other 5 people.

    2) Second time, each one of the 5 people forawer to other 5 people, meaning that the second time the e-mail has reached other 5^2 people.

    3) Third time, each 5^2 people forwarded to other 5 people, so the email reaches other 5^3 people

    4) Fourth time = > 5^4 new people.

    So, the total number (not including Kris) is 5 + 5^2 + 5^3 + 5^4.
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