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JEE Mains · Maths · STD 11 - 8. sequence and series

\(1 + \frac{3}{2} + \frac{7}{4} + \frac{{15}}{8} + \frac{{31}}{{16}} + ...\)  \(20\) પદ સુધી ... = .....

  1. A \(38 + \frac{1}{{{2^{20}}}}\)
  2. B \(39 + \frac{1}{{{2^{19}}}}\)
  3. C \(39 + \frac{1}{{{2^{20}}}}\)
  4. D \(38 + \frac{1}{{{2^{19}}}}\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(38 + \frac{1}{{{2^{19}}}}\)

Step-by-step Solution

Detailed explanation

The general term of the given series \( = \frac{{2 \times {2^r} - 1}}{{{2^r}}}\), Where \(r \ge 0\) \(\therefore \) req.sum \( = 1 + \sum\limits_{r = 1}^{19} {\frac{{2 \times {2^r} - 1}}{{{2^r}}}} \) Now,…
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