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

श्रेणियों \(3+7+11+15+\ldots\) तथा \(1+6+11+16+\ldots \ldots\), के बीच उभयनिष्ठ प्रथम \(20\) पदों का योग है

  1. A \(4000\)
  2. B \(4020\)
  3. C \(4200\)
  4. D \(4220\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(4020\)

Step-by-step Solution

Detailed explanation

Given \(n = 20;\,\,{S_{20}} = ?\) Series \(\left( 1 \right) \to 3,7,11,15,19,23,27,31,35,\) \(39,43,47,\) \(51,55,59...\) Series \(\left( 2 \right) \to 1,6,11,16,21,26,31,36,41,\) \(46,51,56,\) \(61,66,71.\) the common terms between both the series are \(11,13,51,71...\) Above…
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