What is the sum of the first six terms of the series? 40−10+2.5−0.625+... Enter your answer as a simplified fraction in the box.
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The answer is 4096/128
the sequence has each following number divided by 4
so, 40/4 = 10
10/4 = 2.5
2.5/4 = 0.625
0.625/4 = 0.15625
0.15625/4 = 0.0390625
also, the first number is subtracted to its following number and that is then added to its next number which in turn is then subtracted to its next number like this - 40-10+2.5-0.625+0.15625-0.0390625
This results to 31.9921875 or, 4095/128.
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