"If one-fourth of the air in a tank is removed by each stroke of an air pump, find the fractional part of the air remaining after seven strokes of the pump ?"
I'm getting 0.5 after subtracting the sum of (1/4 + 3/16 + 3/64 ... 3/16384). Am I doing something wrong ? For sure 0.5 is not the correct answer as the textbook says.
Thank you once again !