Question

The number of visitors to a website in the first week is 65. The number of visitors each week is double the number of visitors the previous week. What is the total number of visitors to the website in the first 7 weeks? Show your work.

Answer 1

• 8255 visitors

Explanation:

Given a GP where

• a = 65
• r = 2
• n = 7

To find

• S₇ = ?

Solution

• Sₙ = a(rⁿ - 1)/(r -1)
• S₇ = 65(2⁷ - 1)/(2 - 1) = 65*127/1 = 8255