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

અહી \(S_{n}\) એ સમાંતર શ્રેણીના \(n\)- નો સરવાળો દર્શાવે છે. જો \(S_{10}=530, S_{5}=140\) તો  \(\mathrm{S}_{20}-\mathrm{S}_{6}\) ની કિમંત મેળવો.

  1. A \(1852\)
  2. B \(1842\)
  3. C \(1872\)
  4. D \(1862\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(1862\)

Step-by-step Solution

Detailed explanation

\(S_{10}=530 \Rightarrow \frac{10}{2}\{2 a+9 d\}=530\) \(\Rightarrow 2 a+9 d=106 \ldots .(1)\) \(\text { and } S_{5}=140 \Rightarrow \frac{5}{2}\{2 a+4 d\}=140\) \(\Rightarrow 2 a+4 d=56 \ldots . .(2)\) \(\Rightarrow 5 d=50 \Rightarrow d=10 \Rightarrow a=8\) Now,…
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