Multiple choice

What is the sum of first 7 terms of the given sequence? 22, 44, 88, ...

  1. 2718

  2. 2736

  3. 2794

  4. 2803

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is a geometric progression with a=22, r=2. Sum = a(r^n - 1)/(r-1) = 22(2^7 - 1)/(2-1) = 22(128-1) = 22 * 127 = 2794.