defence exam ITBP (Telecommunication) Head Constable Mock Test 2024 Mathematics Sequences and Series Geometric Progressions
What is the sum of first eight terms of the series \(1-\dfrac{1}{2}+\dfrac{1}{4}-\dfrac{1}{8}+...?\)
1
\(\dfrac{89}{128}\)
2
\(\dfrac{57}{384}\)
3
\(\dfrac{85}{128}\)
4
None of the above