Calculate the value of 1−12+14−18+…1 - \frac{1}{2} + \frac{1}{4} - \frac{1}{8} + \dots1−21+41−81+….
23\frac{2}{3}32
12\frac{1}{2}21
34\frac{3}{4}43
13\frac{1}{3}31