Question

19. Deanna received an e-mail asking her to forward it to 1.0 other people. Assume that no one

breaks the chain and that there are no duplicate recipients. How many e-mails will have been sent
after 8 generations, including Deanna's.

Answer 1

111 111 110 .

Explanation:

Deanna's generation is 10^1 ( hers and 9 others that received it)

then each of those 10... send out 10

= 10 *10 = 10^2 this is generation 2

then generation 8 will be 10^8

Now you have to add them all together

10^1 + 10^2 + 10^3 ......+ 10^8

= 111 111 110 e-mails