Nyah receives a chain letter and has to copy the letter and send it to 4 of her friends,

have to copy the letter and send it to 4 other friends, and so on.

Finding the number of letters sent on the nth mailing is an example of

a geometric sequence

COMPLETE

If everyone who receives a letter participates, how many letters will be sent on the si

54 X = 4,096

COMPLETE

By the sixth mailing, how many people will have participated since the start?

DONE

I need the last part

1. Geometric sequence

2. 4,096

3. 5,460

Step-by-step explanation:

Part 1

Since the number of letters sent is multiplied by 4 for any subsequent term, the sequence is an example of a geometric sequence as it grows exponentially.

Part 2

Given a geometric sequence, the nth term is determined using the formula:

In this case,

a=1 (i.e. Nyah)

r=4

Since we want to determine how many letters will be sent on the sixth mailing(i.e after Nyah), n=7

Substituting

Part 3

To determine how many people would have participated by the sixth mailing, we are required to find the sum of the first seven terms of the geometric sequence.

We use the sum of a geometric sequence formula

Therefore, excluding Nyah, 5460 people would have participated by the sixth mailing.

2nd one in the first row is correct

0.02040816326