Ask Question
2 December, 21:28

What is the sum of a 7 term geometric series if the first term is - 11 and the last term is - 45,056, and the common ratio is - 4?

A. - 143,231

B. - 36,047

C. 144,177

D. 716,144

+2
Answers (1)
  1. 2 December, 22:18
    0
    This sequence is:

    a (n) = - 11 (-4) ^ (n-1)

    The sum of the sequence is:

    s (n) = - 11 (1--4^n) / (1--4)

    s (n) = - 11 (1--4^n) / 5

    so for the first seven terms

    s (7) = - 11 (1--4^7) / 5

    s (7) = - 11 (1+16384) / 5

    s (7) = - 11 (16385) / 5

    s (7) = - 36047 B.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “What is the sum of a 7 term geometric series if the first term is - 11 and the last term is - 45,056, and the common ratio is - 4? A. - ...” in 📘 Mathematics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers