Question

The first term of a series is 5 and each subsequent term is −2 times the
previous term. What will be the sum of the first 5 terms of this series

Answer 1

Step-by-step explanation:

1 st term = 5

Next term = -2 * 5 = -10

3rd term = -2*-10 = 20

4th term = -2*20 = -40

5th term = -2*-40 = 80

5 , -10 , 20 , -40 , 80

Sum = 5 + -10 + 20 + -40 + 80 = 55