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Multiple choice

Find the sum of the first $8$ terms of the geometric series if $a_1=2$ and $r = 2$.

  1. $210$
  2. $310$
  3. $410$
  4. $510$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sum of GP = a(r^n - 1) / (r - 1). a = 2, r = 2, n = 8. Sum = 2(2^8 - 1) / (2 - 1) = 2(256 - 1) = 2 * 255 = 510.

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