Question

3. Use the formula to evaluate the series 1 - 2 + 4 - 8+ ... - 10.

Sn
a1(1-7)
1-r
In the formula for a finite series, a, is the first term, r is the common ratio, and n is the number of terms.
-341

1023
-1023

Answer 1

-341

Explanation:

a1=1

r=-2

n=10

1(1-(-2)^10/1-(-2)

Answer 2

it's going to be negative -1023 i think