NDA 2017 — Mathematics PYQNDA | Mathematics | 2017The sum of the first n terms of the series21+43+87+1615+⋯ is equal toChoose the correct answer:A. 2n - n - lB. l - 2- nC. 2- n + n - l (Correct Answer)D. 2n - 1Correct Answer: 2- n + n - lA 2n - n - lB l - 2- nC2- n + n - lD2n - 1Show Answer SExplanationNo text explanation available.