On Monday Ethan sends an email to 3 friends the next day each of the 3 friends forward the email to 3 friends and so on as shown below how many people received the email by Thursday?
Monday 3
Tuesday 3 times 3
Wednesday 3 times 3 times 3
Monday he sends it to 3 friends. Those three friends send it each three times. Friend 1 =3 F2=3 F3=3. So, on Tuesday a total of 3 people received it. By Wednesday a total of 12 people received it. for the Thursday each of them had sent 3 more which totals out to 39 people that had received the email from him.