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

यदि एक समांतर श्रेढ़ी का प्रथम पद \(3\) है तथा इसके प्रथम \(25\) पदों का योग, इसके अगले \(15\) पदों के योग के बराबर है, तो इस समांतर श्रेढ़ी का सार्वअंतर है

  1. A \(\frac{1}{4}\)
  2. B \(\frac{1}{5}\)
  3. C \(\frac{1}{7}\)
  4. D \(\frac{1}{6}\)
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Answer & Solution

Correct Answer

(D) \(\frac{1}{6}\)

Step-by-step Solution

Detailed explanation

Sum of 1 st 25 terms \(=\) sum of its next 15 termss \(\Rightarrow\left( T _{1}+\ldots \ldots+ T _{25}\right)=\left( T _{26}+\ldots . .+ T _{40}\right)\) \(\Rightarrow\left( T _{1}+\ldots . .+ T _{40}\right)=2\left( T _{1}+\ldots \ldots+ T _{25}\right)\)…
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